Public water system record
Boynton PWA
Serves an area of Muskogee County, OK that includes Boynton · 450 people served
Federal records show 36 health-based violations and 58 monitoring/reporting issues for Boynton 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
Purchased surface water
ZIP
74422
EPA system ID
OK3005127
- Health-based violations, last 10 years
- 36
- Resolved
- 4
- Unresolved
- 0
- Archived by EPA
- 32
- Any acute record
- Yes
- Monitoring issues, last 10 years
- 58
Key facts
- Boynton PWA buys its water from Haskell PWA-SWP.
- Highest measured level in the last 10 years: Haloacetic Acids (HAA5), 0.104 mg/L, federal limit 0.06 mg/L (1.7 times the limit), 2021.
- Most recent formal enforcement: compliance order with a penalty by Oklahoma, October 2025.
- Record on file since 1991, with 13 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 215 unknown out of 215 service lines.
Check whether Boynton 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 0.115 mg/L, federal limit 0.08 mg/L (1.4 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 0.114 mg/L, federal limit 0.08 mg/L (1.4 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 0.065 mg/L, federal limit 0.06 mg/L (1.1 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 0.113 mg/L, federal limit 0.08 mg/L (1.4 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 0.079 mg/L, federal limit 0.06 mg/L (1.3 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 0.104 mg/L, federal limit 0.08 mg/L (1.3 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 0.076 mg/L, federal limit 0.06 mg/L (1.3 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 0.083 mg/L, federal limit 0.08 mg/L (at or just above 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 0.064 mg/L, federal limit 0.06 mg/L (1.1 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 0.091 mg/L, federal limit 0.06 mg/L (1.5 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 |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.089 mg/L, federal limit 0.06 mg/L (1.5 times the limit)
|
220 | Apr 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 0.089 mg/L, federal limit 0.06 mg/L (1.5 times the limit)
|
220 | Jan 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 0.089 mg/L, federal limit 0.06 mg/L (1.5 times the limit)
|
220 | Oct 1, 2022 |
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 0.086 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jul 1, 2022 |
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 0.084 mg/L, federal limit 0.06 mg/L (1.4 times the limit)
|
220 | Jul 1, 2022 |
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 0.114 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
220 | Apr 1, 2022 |
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 0.096 mg/L, federal limit 0.06 mg/L (1.6 times the limit)
|
220 | Apr 1, 2022 |
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 0.119 mg/L, federal limit 0.08 mg/L (1.5 times the limit)
|
220 | Jan 1, 2022 |
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 0.098 mg/L, federal limit 0.06 mg/L (1.6 times the limit)
|
220 | Jan 1, 2022 |
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 | Oct 1, 2021 |
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 0.104 mg/L, federal limit 0.06 mg/L (1.7 times the limit)
|
220 | Oct 1, 2021 |
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 0.089 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jul 1, 2021 |
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 0.078 mg/L, federal limit 0.06 mg/L (1.3 times the limit)
|
220 | Jul 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Revised Total Coliform Rule
Contaminant limit exceeded
|
110 | Aug 1, 2020 | Resolved | Yes |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.087 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jul 1, 2020 |
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 0.101 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
220 | Apr 1, 2020 |
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 0.084 mg/L, federal limit 0.06 mg/L (1.4 times the limit)
|
220 | Apr 1, 2020 |
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 | Jan 1, 2020 |
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 0.083 mg/L, federal limit 0.06 mg/L (1.4 times the limit)
|
220 | Jan 1, 2020 |
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 0.1 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
220 | Oct 1, 2019 |
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 0.086 mg/L, federal limit 0.06 mg/L (1.4 times the limit)
|
220 | Oct 1, 2019 |
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 0.091 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jul 1, 2019 |
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, 2019 |
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 0.089 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Apr 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.091 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jan 1, 2017 | 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 |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2025 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
LEAD AND COPPER RULE REVISIONS
RPT
|
Oct 17, 2024 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jul 1, 2024 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jul 1, 2024 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Oct 2, 2023 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jun 1, 2023 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jun 1, 2023 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Mar 1, 2023 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Mar 1, 2023 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Sep 29, 2022 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Sep 29, 2022 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Dec 30, 2021 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Dec 30, 2021 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Mar 1, 2021 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Mar 1, 2021 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Sep 1, 2020 | Resolved |
|
Chlorine
Monitoring and reporting
|
Jul 1, 2020 | Resolved |
|
Chlorine
Monitoring and reporting
|
Jul 1, 2020 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jun 30, 2020 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jun 30, 2020 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jun 1, 2020 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jun 1, 2020 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
May 1, 2020 | Resolved |
|
Chlorine
Monitoring and reporting
|
Apr 1, 2020 | Resolved |
|
Chlorine
Monitoring and reporting
|
Apr 1, 2020 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Mar 31, 2020 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Mar 31, 2020 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Dec 30, 2019 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Dec 30, 2019 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Nov 1, 2019 | Resolved |
|
Chlorine
Monitoring and reporting
|
Oct 1, 2019 | Resolved |
|
Chlorine
Monitoring and reporting
|
Oct 1, 2019 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Sep 29, 2019 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Sep 29, 2019 | Resolved |
|
Chlorine
Monitoring and reporting
|
Jul 1, 2019 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jun 30, 2019 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
May 1, 2019 | Resolved |
|
Chlorine
Monitoring and reporting
|
Apr 1, 2019 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jun 1, 2018 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jun 1, 2018 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Sep 29, 2017 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jun 30, 2017 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jun 1, 2017 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jun 1, 2017 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Dec 30, 2016 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Sep 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Sep 1, 2016 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Dec 30, 2015 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jul 1, 2015 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2015 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2014 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2013 | Resolved |
Full record since 1991
EPA's records for Boynton PWA go back to 1991. Before October 19, 2016 they list 13 health-based violations (12 resolved, 1 archived by EPA without a recorded fix) and 64 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 3 | 9 |
| 2000s | 4 | 7 |
| 2010 to October 18, 2016 | 6 | 48 |
| October 19, 2016 to 2019 | 6 | 18 |
| 2020s | 30 | 32 |
Most recent health-based violation before October 19, 2016: Haloacetic Acids (HAA5), began April 2014, Resolved.
Show all 13 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.067 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
Apr 1, 2014 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.071 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
|
Jan 1, 2014 | 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, 2013 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Apr 1, 2013 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Jan 1, 2013 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 2010 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Dec 1, 2002 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 2002 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2002 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 2002 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 1999 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 1992 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Apr 1, 1991 | Resolved |
Enforcement actions
Oklahoma regulators took 13 formal enforcement actions against Boynton PWA and issued 1 boil water order between 2012 and 2025, filed as 15 records in EPA's data. The most recent was a compliance order with a penalty in October 2025.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Oct 30, 2025 | Oklahoma | Compliance order with a penalty | 32 violations (32 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5) |
| Apr 20, 2021 | Oklahoma | Compliance order with a penalty | 31 violations (31 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5) |
| Dec 16, 2020 | Oklahoma | Compliance order (no penalty) | 1 violation (1 health-based): Total Trihalomethanes (TTHMs) |
| Aug 12, 2020 | Oklahoma | Boil water order | 1 violation (1 health-based): Revised Total Coliform Rule |
| Aug 7, 2020 | Oklahoma | Compliance order (no penalty) | 4 violations (4 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs) |
| May 1, 2020 | Oklahoma | Compliance order (no penalty) | 2 violations (2 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5) |
| Feb 4, 2020 | Oklahoma | Compliance order (no penalty) | 2 violations (2 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs) |
| Oct 7, 2019 | Oklahoma | Compliance order (no penalty) | 2 violations (2 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs) |
| Sep 8, 2017 | Oklahoma | Compliance order with a penalty | 1 violation (1 health-based): Total Trihalomethanes (TTHMs) |
| May 22, 2017 | Oklahoma | Compliance order with a penalty | 1 violation (1 health-based): Total Trihalomethanes (TTHMs) |
| Jul 31, 2014 | Oklahoma | Compliance order with a penalty | 1 violation (1 health-based): Haloacetic Acids (HAA5) |
| May 13, 2014 | Oklahoma | Compliance order with a penalty | 2 violations (2 health-based): Haloacetic Acids (HAA5) |
| Sep 17, 2013 | Oklahoma | Compliance order with a penalty | 3 violations: Total Coliform |
| Oct 3, 2012 | Oklahoma | Compliance order with a penalty | 3 violations: Consumer Confidence Rule |
What the violations mean
Total Trihalomethanes (TTHMs)
17 incidentsDisinfection byproduct levels exceeded the federal limit
Long-term TTHM exposure may increase bladder cancer risk
Haloacetic Acids (HAA5)
17 incidentsHaloacetic acid byproducts exceeded the federal limit
Long-term exposure to HAAs may increase cancer risk
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.
Revised Total Coliform Rule
1 incidentThe system did not meet a requirement of the Revised Total Coliform Rule
Coliform and E. coli rules protect against bacteria in the distribution system
Where the water comes from
Boynton PWA buys its water from Haskell PWA-SWP. It lists no wells or intakes of its own. 1 other community water system buys water from Boynton PWA.
Buys water from
- Haskell PWA-SWP Haskell, OK
Community systems that buy water from it
- Muskogee Co. RWD #14 Boynton, OK
Annual water quality report
Boynton 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.
Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Boynton PWA for a copy.
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