Public water system record
Locust Grove PWA
Serves an area of Mayes County, OK that includes Locust Grove and Iron Post · 1,600 people served
Federal records show 2 health-based violations and 184 monitoring/reporting issues for Locust Grove PWA in the last ten years. The most serious issue in this window was a Total Trihalomethanes (TTHMs) violation that EPA lists as archived, not resolved.
System profile
Source water
Surface water
ZIP
74352
EPA system ID
OK1021668
- Health-based violations, last 10 years
- 2
- Resolved
- 0
- Unresolved
- 0
- Archived by EPA
- 2
- Any acute record
- No
- Monitoring issues, last 10 years
- 184
Key facts
- Locust Grove PWA draws water from 1 surface water intake.
- Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.098 mg/L, federal limit 0.08 mg/L (1.2 times the limit), 2025.
- Most recent formal enforcement: compliance order (no penalty) by Oklahoma, November 2025.
- Record on file since 1993, with 72 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 998 unknown out of 1,039 service lines.
Check whether Locust Grove PWA serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.098 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Oct 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.083 mg/L, federal limit 0.08 mg/L (at or just above the limit)
|
220 | Jul 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Oct 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Oct 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Nov 1, 2024 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Oct 1, 2024 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Sep 1, 2024 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Jul 1, 2024 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2024 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Jun 1, 2024 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
May 1, 2024 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Apr 1, 2024 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Mar 1, 2024 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Feb 1, 2024 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Dec 1, 2023 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Nov 1, 2023 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Oct 1, 2023 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Sep 1, 2023 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Aug 1, 2023 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Jul 1, 2023 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Jun 1, 2023 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
May 1, 2023 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
May 1, 2023 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Apr 1, 2023 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Mar 1, 2023 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Mar 1, 2023 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Jan 1, 2023 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Nov 1, 2022 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Oct 1, 2022 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Aug 1, 2022 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Aug 1, 2022 | Resolved |
|
Chlordane
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
ETHYLENE DIBROMIDE
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
1,2-DIBROMO-3-CHLOROPROPANE
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Total Polychlorinated Biphenyls (PCB)
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Pentachlorophenol
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Benzo(a)pyrene
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
HEXACHLOROBENZENE
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
2,4,5-TP
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
2,4-D
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Heptachlor epoxide
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Heptachlor
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
LASSO
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Carbofuran
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Hexachlorocyclopentadiene
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Dinoseb
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Picloram
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Di(2-ethylhexyl) phthalate
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Simazine
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
OXAMYL
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Di(2-ethylhexyl) adipate
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Glyphosate
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Endothall
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Diquat
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Dalapon
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Toxaphene
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Methoxychlor
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
BHC-GAMMA
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Endrin
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Mar 1, 2022 | Resolved |
|
Chlordane
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
ETHYLENE DIBROMIDE
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
1,2-DIBROMO-3-CHLOROPROPANE
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Total Polychlorinated Biphenyls (PCB)
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Pentachlorophenol
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Benzo(a)pyrene
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
HEXACHLOROBENZENE
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
2,4,5-TP
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
2,4-D
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Heptachlor epoxide
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Heptachlor
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
LASSO
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Carbofuran
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Hexachlorocyclopentadiene
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Dinoseb
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Picloram
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Di(2-ethylhexyl) phthalate
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Simazine
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
OXAMYL
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Di(2-ethylhexyl) adipate
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Glyphosate
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Endothall
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Diquat
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Dalapon
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Toxaphene
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Methoxychlor
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
BHC-GAMMA
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Endrin
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Nov 1, 2021 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Oct 1, 2021 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Sep 1, 2021 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Aug 1, 2021 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Jul 1, 2021 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Jun 1, 2021 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
May 1, 2021 | Resolved |
|
Pentachlorophenol
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Chlordane
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
ETHYLENE DIBROMIDE
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
1,2-DIBROMO-3-CHLOROPROPANE
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Total Polychlorinated Biphenyls (PCB)
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Benzo(a)pyrene
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
HEXACHLOROBENZENE
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
2,4,5-TP
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
2,4-D
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Heptachlor epoxide
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Heptachlor
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
LASSO
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Carbofuran
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Hexachlorocyclopentadiene
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Dinoseb
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Picloram
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Di(2-ethylhexyl) phthalate
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Simazine
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
OXAMYL
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Di(2-ethylhexyl) adipate
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Glyphosate
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Endothall
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Diquat
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Dalapon
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Toxaphene
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Methoxychlor
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
BHC-GAMMA
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Endrin
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Mar 1, 2021 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Feb 1, 2021 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Dec 1, 2020 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Nov 1, 2020 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Nov 1, 2020 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Nov 1, 2020 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Jul 1, 2020 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Jun 1, 2020 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Nov 1, 2019 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Oct 1, 2019 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Sep 1, 2019 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Jul 1, 2019 | Resolved |
|
Chlorine
Monitoring and reporting
|
Jul 1, 2019 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Jun 1, 2019 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
May 1, 2019 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Apr 1, 2019 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Mar 1, 2019 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Feb 1, 2019 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Oct 1, 2018 | Resolved |
|
Atrazine
Monitoring and reporting
|
Jul 1, 2018 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Apr 1, 2018 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Mar 1, 2018 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Dec 1, 2017 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Aug 1, 2017 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Jul 1, 2017 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Jun 1, 2017 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Mar 1, 2017 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Feb 1, 2017 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Nov 1, 2016 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Oct 1, 2016 | Resolved |
|
Styrene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Ethylbenzene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Toluene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Benzene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
CHLOROBENZENE
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Tetrachloroethylene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
1,1,2-Trichloroethane
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Trichloroethylene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
1,2-Dichloropropane
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Carbon tetrachloride
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
1,1,1-Trichloroethane
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
1,2-Dichloroethane
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
trans-1,2-Dichloroethylene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
1,1-Dichloroethylene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Vinyl chloride
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
p-Dichlorobenzene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
o-Dichlorobenzene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
DICHLOROMETHANE
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Xylenes, Total
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
cis-1,2-Dichloroethylene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
1,2,4-Trichlorobenzene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Gross Beta Particle Activity
Monitoring and reporting
|
Jan 1, 2008 | Resolved |
|
Combined Radium (-226 and -228)
Monitoring and reporting
|
Jan 1, 2008 | Resolved |
|
Combined Uranium
Monitoring and reporting
|
Jan 1, 2008 | Resolved |
|
Gross Alpha, Excl. Radon and U
Monitoring and reporting
|
Jan 1, 2008 | Resolved |
Full record since 1993
EPA's records for Locust Grove PWA go back to 1993. Before October 19, 2016 they list 72 health-based violations (65 resolved, 7 archived by EPA without a recorded fix) and 91 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 19 | 6 |
| 2000s | 33 | 46 |
| 2010 to October 18, 2016 | 20 | 39 |
| October 19, 2016 to 2019 | 0 | 24 |
| 2020s | 2 | 134 |
Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began January 2013, Resolved.
Show all 72 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.095 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Jan 1, 2013 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Oct 1, 2012 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.108 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
Oct 1, 2012 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Jul 1, 2012 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.112 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
Jul 1, 2012 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Apr 1, 2012 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.122 mg/L, federal limit 0.08 mg/L (1.5 times the limit)
|
Apr 1, 2012 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Jan 1, 2012 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.061 mg/L, federal limit 0.06 mg/L (at or just above the limit)
|
Jan 1, 2012 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.099 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Jan 1, 2012 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.093 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Oct 1, 2011 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.101 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
Jul 1, 2011 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.101 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
Apr 1, 2011 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.108 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
Jan 1, 2011 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.104 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
Oct 1, 2010 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.087 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Jul 1, 2010 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.074 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
|
Apr 1, 2010 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.097 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Apr 1, 2010 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.098 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Jan 1, 2010 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.077 mg/L, federal limit 0.06 mg/L (1.3 times the limit)
|
Jan 1, 2010 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Nov 1, 2009 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.087 mg/L, federal limit 0.06 mg/L (1.5 times the limit)
|
Oct 1, 2009 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.115 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
Oct 1, 2009 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Jul 1, 2009 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jul 1, 2009 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jun 1, 2009 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
May 1, 2009 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Apr 1, 2009 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Apr 1, 2009 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Jan 1, 2009 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Aug 1, 2008 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Aug 1, 2008 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Jul 1, 2008 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Jun 1, 2008 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.084 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Oct 1, 2007 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Oct 1, 2007 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Jul 1, 2007 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.091 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Jul 1, 2007 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.099 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Apr 1, 2007 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.091 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Jan 1, 2007 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Jan 1, 2007 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.095 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Oct 1, 2006 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.105 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
Jul 1, 2006 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.109 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
Apr 1, 2006 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.105 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
Jan 1, 2006 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Oct 1, 2005 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Jul 1, 2005 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Apr 1, 2005 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Jan 1, 2005 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Jan 1, 2005 | Resolved |
22 older violations are not listed here. EPA ECHO has the complete list.
Enforcement actions
Oklahoma regulators took 26 formal enforcement actions against Locust Grove PWA and issued 1 boil water order between 1993 and 2025, filed as 28 records in EPA's data. The most recent was a compliance order (no penalty) in November 2025.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Nov 19, 2025 | Oklahoma | Compliance order (no penalty) | 1 violation (1 health-based): Total Trihalomethanes (TTHMs) |
| Aug 20, 2012 | Oklahoma | Compliance order with a penalty | 41 violations (41 health-based): CARBON, TOTAL, Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5) |
| Mar 1, 2010 | Oklahoma | Compliance order with a penalty | 61 violations (36 health-based): CARBON, TOTAL, Surface Water Treatment Rule, Total Trihalomethanes (TTHMs), Interim Enhanced Surface Water Treatment Rule, Total Coliform |
| Feb 11, 2010 | Oklahoma | Compliance order with a penalty | 1 violation (1 health-based): Interim Enhanced Surface Water Treatment Rule |
| Sep 15, 2009 | Oklahoma | Compliance order with a penalty | 7 violations (4 health-based): Surface Water Treatment Rule |
| Aug 4, 2009 | Oklahoma | Compliance order with a penalty | 6 violations (6 health-based): Interim Enhanced Surface Water Treatment Rule |
| May 5, 2009 | Oklahoma | Compliance order with a penalty | 1 violation: Nitrate-Nitrite |
| Oct 20, 2008 | Oklahoma | Compliance order with a penalty | 3 violations (3 health-based): Interim Enhanced Surface Water Treatment Rule |
| Sep 23, 2008 | Oklahoma | Compliance order with a penalty | 4 violations (4 health-based): Interim Enhanced Surface Water Treatment Rule |
| Mar 25, 2008 | Oklahoma | Compliance order with a penalty | 2 violations: Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs) |
| Mar 6, 2008 | Oklahoma | Compliance order with a penalty | 1 violation (1 health-based): Interim Enhanced Surface Water Treatment Rule |
| Sep 21, 2007 | Oklahoma | Compliance order with a penalty | 1 violation (1 health-based): Total Trihalomethanes (TTHMs) |
| May 16, 2007 | Oklahoma | Compliance order with a penalty | 1 violation (1 health-based): Total Trihalomethanes (TTHMs) |
| Apr 16, 2007 | Oklahoma | Compliance order with a penalty | 2 violations (2 health-based): Total Trihalomethanes (TTHMs), Interim Enhanced Surface Water Treatment Rule |
| Dec 8, 2006 | Oklahoma | Compliance order with a penalty | 1 violation (1 health-based): Total Trihalomethanes (TTHMs) |
| Sep 21, 2006 | Oklahoma | Compliance order (no penalty) | 75 violations (40 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs), CARBON, TOTAL, Total Coliform, 1,2,4-Trichlorobenzene |
| Aug 9, 2006 | Oklahoma | Compliance order with a penalty | 1 violation (1 health-based): Total Trihalomethanes (TTHMs) |
| Apr 7, 2006 | Oklahoma | Compliance order with a penalty | 1 violation (1 health-based): Total Trihalomethanes (TTHMs) |
| Jan 25, 2006 | Oklahoma | Compliance order with a penalty | 2 violations (2 health-based): Total Trihalomethanes (TTHMs) |
| Nov 14, 2005 | Oklahoma | Compliance order with a penalty | 2 violations (2 health-based): CARBON, TOTAL, Total Trihalomethanes (TTHMs) |
| May 2, 2005 | Oklahoma | Compliance order with a penalty | 2 violations (2 health-based): Total Trihalomethanes (TTHMs), CARBON, TOTAL |
| Jan 14, 2005 | Oklahoma | Compliance order with a penalty | 1 violation (1 health-based): Total Trihalomethanes (TTHMs) |
| Feb 13, 2003 | Oklahoma | Compliance order with a penalty | 1 violation: Nitrate |
| Apr 25, 2002 | Oklahoma | Compliance order with a penalty | 20 violations: 1,2,4-Trichlorobenzene, cis-1,2-Dichloroethylene, DICHLOROMETHANE, o-Dichlorobenzene, p-Dichlorobenzene |
| Dec 17, 1996 | Oklahoma | Compliance order (no penalty) | 1 violation (1 health-based): Surface Water Treatment Rule |
| Dec 9, 1994 | Oklahoma | Compliance order (no penalty) | 2 violations (2 health-based): Surface Water Treatment Rule |
| Sep 1, 1993 | Oklahoma | Boil water order | 1 violation (1 health-based): Total Coliform |
What the violations mean
Total Trihalomethanes (TTHMs)
2 incidentsDisinfection byproduct levels exceeded the federal limit
Long-term TTHM exposure may increase bladder cancer risk
Where the water comes from
Locust Grove PWA draws water from 1 surface water intake.
Annual water quality report
Locust Grove PWA must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Oklahoma.
Certified drinking water labs by state EPA guidance for private wells