Public water system record
Coweta PWA
Serves Coweta, Wagoner County, OK · 9,450 people served
Federal records show 41 health-based violations and 26 monitoring/reporting issues for Coweta 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
74429
EPA system ID
OK1021509
- Health-based violations, last 10 years
- 41
- Resolved
- 12
- Unresolved
- 0
- Archived by EPA
- 29
- Any acute record
- Yes
- Monitoring issues, last 10 years
- 26
Key facts
- Coweta PWA draws water from 1 surface water intake.
- Highest measured level in the last 10 years: Haloacetic Acids (HAA5), 0.131 mg/L, federal limit 0.06 mg/L (2.2 times the limit), 2025.
- Most recent formal enforcement: compliance order (no penalty) by Oklahoma, November 2025.
- Record on file since 1991, with 95 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 1,334 unknown out of 6,123 service lines.
Check whether Coweta 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 0.107 mg/L, federal limit 0.08 mg/L (1.3 times 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 |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.093 mg/L, federal limit 0.08 mg/L (1.2 times 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 |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.087 mg/L, federal limit 0.06 mg/L (1.5 times 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 |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.062 mg/L, federal limit 0.06 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 |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.14 mg/L, federal limit 0.08 mg/L (1.8 times the limit)
|
220 | Apr 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 0.133 mg/L, federal limit 0.08 mg/L (1.7 times the limit)
|
220 | Apr 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.099 mg/L, federal limit 0.06 mg/L (1.7 times the limit)
|
220 | Apr 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.131 mg/L, federal limit 0.06 mg/L (2.2 times the limit)
|
220 | Apr 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 0.135 mg/L, federal limit 0.08 mg/L (1.7 times the limit)
|
220 | Jan 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.119 mg/L, federal limit 0.06 mg/L (2 times the limit)
|
220 | Jan 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 0.131 mg/L, federal limit 0.08 mg/L (1.6 times the limit)
|
220 | Jan 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.085 mg/L, federal limit 0.06 mg/L (1.4 times the limit)
|
220 | Jan 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
LEAD AND COPPER RULE REVISIONS
Treatment technique failure
|
350 | Oct 17, 2024 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.134 mg/L, federal limit 0.08 mg/L (1.7 times the limit)
|
220 | Oct 1, 2024 |
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 0.139 mg/L, federal limit 0.08 mg/L (1.7 times the limit)
|
220 | Oct 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.081 mg/L, federal limit 0.06 mg/L (1.4 times the limit)
|
220 | Oct 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.118 mg/L, federal limit 0.06 mg/L (2 times the limit)
|
220 | Oct 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Aug 1, 2024 |
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 0.127 mg/L, federal limit 0.08 mg/L (1.6 times the limit)
|
220 | Jul 1, 2024 |
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 0.121 mg/L, federal limit 0.08 mg/L (1.5 times the limit)
|
220 | Jul 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.089 mg/L, federal limit 0.06 mg/L (1.5 times the limit)
|
220 | Jul 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.07 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
|
220 | Jul 1, 2024 |
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 0.095 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Apr 1, 2024 |
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 0.099 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Apr 1, 2024 |
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 0.094 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Jan 1, 2024 |
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 0.088 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jan 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Nov 1, 2023 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Oct 1, 2023 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.099 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Oct 1, 2023 |
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 0.094 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Oct 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Interim Enhanced Surface Water Treatment Rule
Treatment technique failure
|
120 | Sep 1, 2023 | Resolved | Yes |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.09 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jul 1, 2023 |
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, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.061 mg/L, federal limit 0.06 mg/L (at or just above the limit)
|
220 | Jan 1, 2020 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.074 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
|
220 | Jan 1, 2020 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.076 mg/L, federal limit 0.06 mg/L (1.3 times the limit)
|
220 | Oct 1, 2019 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.086 mg/L, federal limit 0.06 mg/L (1.4 times the limit)
|
220 | Oct 1, 2019 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.069 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
|
220 | Jul 1, 2019 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.079 mg/L, federal limit 0.06 mg/L (1.3 times the limit)
|
220 | Jul 1, 2019 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.08 mg/L, federal limit 0.06 mg/L (1.3 times the limit)
|
220 | Apr 1, 2019 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.073 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
|
220 | Apr 1, 2019 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2025 | Active |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jun 30, 2025 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jun 30, 2025 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Dec 30, 2024 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Dec 30, 2024 | Resolved |
|
LEAD AND COPPER RULE REVISIONS
RPT
|
Oct 17, 2024 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2024 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Mar 31, 2024 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Mar 1, 2024 | Resolved |
|
Hexachlorocyclopentadiene
Monitoring and reporting
|
Jan 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Simazine
Monitoring and reporting
|
Jan 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Glyphosate
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Dec 30, 2023 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Dec 30, 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 |
|
Revised Total Coliform Rule
Monitoring violation
|
Sep 1, 2023 | Resolved |
|
Chlorine
Monitoring and reporting
|
Jul 1, 2023 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jun 30, 2023 | Resolved |
|
Hexachlorocyclopentadiene
Monitoring and reporting
|
Jan 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Glyphosate
Monitoring and reporting
|
Jan 1, 2023 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Mar 31, 2020 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Mar 31, 2020 | Resolved |
|
CARBON, TOTAL
Monitoring and reporting
|
Apr 1, 2019 | Resolved |
|
CARBON, TOTAL
Monitoring and reporting
|
Apr 1, 2019 | Resolved |
|
Fluoride
Monitoring and reporting
|
Jan 1, 2011 | Resolved |
Full record since 1991
EPA's records for Coweta PWA go back to 1991. Before October 19, 2016 they list 95 health-based violations (93 resolved, 2 archived by EPA without a recorded fix) and 37 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 2 | 4 |
| 2000s | 60 | 27 |
| 2010 to October 18, 2016 | 33 | 6 |
| October 19, 2016 to 2019 | 6 | 2 |
| 2020s | 35 | 23 |
Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began July 2014, Resolved.
Show all 95 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.096 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Jul 1, 2014 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.064 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
Jul 1, 2014 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.087 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Jan 1, 2013 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.092 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Oct 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)
|
Jul 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)
|
Jul 1, 2012 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Apr 1, 2012 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.09 mg/L, federal limit 0.06 mg/L (1.5 times the limit)
|
Apr 1, 2012 | 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, 2012 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Jan 1, 2012 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.084 mg/L, federal limit 0.06 mg/L (1.4 times the limit)
|
Jan 1, 2012 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.094 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Jan 1, 2012 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.063 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
Oct 1, 2011 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Oct 1, 2011 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Jul 1, 2011 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.062 mg/L, federal limit 0.06 mg/L (at or just above the limit)
|
Jul 1, 2011 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 2011 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Apr 1, 2011 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Jan 1, 2011 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.102 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
Jan 1, 2011 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.076 mg/L, federal limit 0.06 mg/L (1.3 times the limit)
|
Jan 1, 2011 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Oct 1, 2010 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.123 mg/L, federal limit 0.06 mg/L (2.1 times the limit)
|
Oct 1, 2010 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.143 mg/L, federal limit 0.08 mg/L (1.8 times the limit)
|
Oct 1, 2010 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Jul 1, 2010 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.106 mg/L, federal limit 0.06 mg/L (1.8 times the limit)
|
Jul 1, 2010 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.142 mg/L, federal limit 0.08 mg/L (1.8 times the limit)
|
Jul 1, 2010 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Apr 1, 2010 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.129 mg/L, federal limit 0.06 mg/L (2.2 times the limit)
|
Apr 1, 2010 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.173 mg/L, federal limit 0.08 mg/L (2.2 times the limit)
|
Apr 1, 2010 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Jan 1, 2010 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.165 mg/L, federal limit 0.08 mg/L (2.1 times the limit)
|
Jan 1, 2010 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.129 mg/L, federal limit 0.06 mg/L (2.2 times the limit)
|
Jan 1, 2010 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.161 mg/L, federal limit 0.08 mg/L (2 times the limit)
|
Oct 1, 2009 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.119 mg/L, federal limit 0.06 mg/L (2 times the limit)
|
Oct 1, 2009 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Oct 1, 2009 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.112 mg/L, federal limit 0.06 mg/L (1.9 times the limit)
|
Jul 1, 2009 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Jul 1, 2009 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.2 mg/L, federal limit 0.08 mg/L (2.5 times the limit)
|
Jul 1, 2009 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Apr 1, 2009 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.067 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
Apr 1, 2009 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.193 mg/L, federal limit 0.08 mg/L (2.4 times the limit)
|
Apr 1, 2009 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Jan 1, 2009 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.193 mg/L, federal limit 0.08 mg/L (2.4 times the limit)
|
Jan 1, 2009 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.065 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
Jan 1, 2009 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Oct 1, 2008 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.195 mg/L, federal limit 0.08 mg/L (2.4 times the limit)
|
Oct 1, 2008 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.069 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
|
Oct 1, 2008 | Resolved |
|
CARBON, TOTAL
Treatment technique failure
|
Jul 1, 2008 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.109 mg/L, federal limit 0.06 mg/L (1.8 times the limit)
|
Jul 1, 2008 | Resolved |
45 older violations are not listed here. EPA ECHO has the complete list.
Enforcement actions
Oklahoma regulators took 41 formal enforcement actions against Coweta PWA between 1998 and 2025, filed as 43 records in EPA's data. The most recent was a compliance order (no penalty) in November 2025.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Nov 12, 2025 | Oklahoma | Compliance order (no penalty) | 4 violations (4 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs) |
| Aug 7, 2025 | Oklahoma | Compliance order (no penalty) | 4 violations (4 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5) |
| May 8, 2025 | Oklahoma | Compliance order (no penalty) | 4 violations (4 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs) |
| Mar 7, 2025 | Oklahoma | Compliance order (no penalty) | 4 violations (4 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs) |
| Oct 31, 2024 | Oklahoma | Compliance order (no penalty) | 4 violations (4 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs) |
| Oct 9, 2024 | Oklahoma | Compliance order (no penalty) | 1 violation (1 health-based): Surface Water Treatment Rule |
| Jul 31, 2024 | Oklahoma | Compliance order (no penalty) | 2 violations (2 health-based): Total Trihalomethanes (TTHMs) |
| May 3, 2024 | Oklahoma | Compliance order (no penalty) | 2 violations (2 health-based): Total Trihalomethanes (TTHMs) |
| Feb 20, 2024 | Oklahoma | Compliance order (no penalty) | 2 violations (2 health-based): Surface Water Treatment Rule |
| Feb 8, 2024 | Oklahoma | Compliance order (no penalty) | 2 violations (2 health-based): Total Trihalomethanes (TTHMs) |
| Jan 4, 2024 | Oklahoma | Compliance order (no penalty) | 1 violation (1 health-based): Interim Enhanced Surface Water Treatment Rule |
| Nov 15, 2023 | Oklahoma | Compliance order (no penalty) | 4 violations (4 health-based): Total Trihalomethanes (TTHMs) |
| May 8, 2020 | Oklahoma | Compliance order (no penalty) | 4 violations (4 health-based): Haloacetic Acids (HAA5) |
| Feb 4, 2020 | Oklahoma | Compliance order (no penalty) | 2 violations (2 health-based): Haloacetic Acids (HAA5) |
| Nov 5, 2019 | Oklahoma | Compliance order (no penalty) | 2 violations (2 health-based): Haloacetic Acids (HAA5) |
| Nov 4, 2014 | Oklahoma | Compliance order with a penalty | 2 violations (2 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs) |
| Jun 21, 2012 | Oklahoma | Compliance order with a penalty | 87 violations (87 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs), CARBON, TOTAL |
| Jul 20, 2010 | Oklahoma | Compliance order with a penalty | 91 violations (86 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs), CARBON, TOTAL |
| May 3, 2010 | Oklahoma | Compliance order with a penalty | 3 violations (3 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs), CARBON, TOTAL |
| Jan 15, 2010 | Oklahoma | Compliance order with a penalty | 3 violations (3 health-based): CARBON, TOTAL, Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5) |
| Oct 27, 2009 | Oklahoma | Compliance order with a penalty | 3 violations (3 health-based): CARBON, TOTAL, Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs) |
| Aug 7, 2009 | Oklahoma | Compliance order with a penalty | 3 violations (3 health-based): Total Trihalomethanes (TTHMs), CARBON, TOTAL, Haloacetic Acids (HAA5) |
| Apr 23, 2009 | Oklahoma | Compliance order with a penalty | 3 violations (3 health-based): Haloacetic Acids (HAA5), CARBON, TOTAL, Total Trihalomethanes (TTHMs) |
| Jan 27, 2009 | Oklahoma | Compliance order with a penalty | 3 violations (3 health-based): Total Trihalomethanes (TTHMs), CARBON, TOTAL, Haloacetic Acids (HAA5) |
| Nov 5, 2008 | Oklahoma | Compliance order with a penalty | 3 violations (3 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5), CARBON, TOTAL |
| Aug 28, 2008 | Oklahoma | Compliance order with a penalty | 6 violations (6 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs), CARBON, TOTAL |
| Jul 28, 2008 | Oklahoma | Compliance order with a penalty | 1 violation (1 health-based): Interim Enhanced Surface Water Treatment Rule |
| Mar 18, 2008 | Oklahoma | Compliance order with a penalty | 3 violations (3 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5), CARBON, TOTAL |
| Jan 15, 2008 | Oklahoma | Compliance order with a penalty | 3 violations (3 health-based): CARBON, TOTAL, Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs) |
| Jan 9, 2008 | Oklahoma | Compliance order with a penalty | 3 violations (3 health-based): Total Trihalomethanes (TTHMs), CARBON, TOTAL, Haloacetic Acids (HAA5) |
| May 31, 2007 | Oklahoma | Compliance order with a penalty | 4 violations (4 health-based): Interim Enhanced Surface Water Treatment Rule, Total Trihalomethanes (TTHMs), CARBON, TOTAL, Haloacetic Acids (HAA5) |
| Feb 20, 2007 | Oklahoma | Compliance order with a penalty | 3 violations (3 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5), CARBON, TOTAL |
| Nov 7, 2006 | Oklahoma | Compliance order with a penalty | 3 violations (3 health-based): Haloacetic Acids (HAA5), CARBON, TOTAL, Total Trihalomethanes (TTHMs) |
| Sep 26, 2006 | Oklahoma | Compliance order with a penalty | 2 violations (2 health-based): CARBON, TOTAL, Total Trihalomethanes (TTHMs) |
| Sep 7, 2006 | Oklahoma | Compliance order with a penalty | 2 violations (2 health-based): Total Trihalomethanes (TTHMs), CARBON, TOTAL |
| Apr 14, 2006 | Oklahoma | Compliance order with a penalty | 2 violations (2 health-based): Total Trihalomethanes (TTHMs), CARBON, TOTAL |
| Jan 26, 2006 | Oklahoma | Compliance order with a penalty | 5 violations (4 health-based): CARBON, TOTAL, Total Trihalomethanes (TTHMs) |
| Jun 24, 2005 | Oklahoma | Compliance order with a penalty | 6 violations (4 health-based): Total Trihalomethanes (TTHMs), CARBON, TOTAL |
| Apr 5, 2005 | Oklahoma | Compliance order with a penalty | 1 violation (1 health-based): Interim Enhanced Surface Water Treatment Rule |
| Jan 11, 2005 | Oklahoma | Compliance order with a penalty | 1 violation (1 health-based): Total Trihalomethanes (TTHMs) |
| Feb 19, 1998 | Oklahoma | Compliance order (no penalty) | 1 violation (1 health-based): Surface Water Treatment Rule |
What the violations mean
Total Trihalomethanes (TTHMs)
18 incidentsDisinfection byproduct levels exceeded the federal limit
Long-term TTHM exposure may increase bladder cancer risk
Haloacetic Acids (HAA5)
18 incidentsHaloacetic acid byproducts exceeded the federal limit
Long-term exposure to HAAs may increase cancer risk
Surface Water Treatment Rule
3 incidentsThe system did not complete a treatment step or action that the Surface Water Treatment Rule requires (a treatment technique violation).
The utility had to notify customers about each of these violations.
LEAD AND COPPER RULE REVISIONS
1 incidentThe system did not complete a treatment step or action that the LEAD AND COPPER RULE REVISIONS requires (a treatment technique violation).
The utility had to notify customers about this violation.
Interim Enhanced Surface Water Treatment Rule
1 incidentThe system did not meet a filtration or treatment requirement for surface water
Inadequate treatment of surface water can let pathogens such as Cryptosporidium and Giardia through
Where the water comes from
Coweta PWA draws water from 1 surface water intake.
Annual water quality report
Coweta 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