ADA
PWS ID: OK2006201 · ADA, Oklahoma 74820-6443
ADA serves 22,600 people in ADA, Oklahoma using Groundwater water sources. It has 34 recorded EPA violations, including 7 health-based violations. No PFAS contamination was detected in UCMR5 testing.
Water Quality Snapshot: ADA
ADA is a local-owned community water system that delivers drinking water to 22,600 residents in ADA, Oklahoma (Pontotoc County) through 11,575 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 34 total violations for this system , of which 7 (21%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 17 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.
The most frequently cited contaminant at this system is Coliform (TCR), recorded in 8 violations (MR). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.
Across Oklahoma, EPA tracks 1,262 public water systems serving 3,699,452 people, with 336,706 cumulative violations and 113,804 health-based violations on record. About 98% of systems in the state carry at least one violation, and state-wide the average per system is 266.8 violations. ADA's 34 violations sit below the Oklahoma average. Statewide, 101 of 166 UCMR5-tested systems have reported PFAS detections (60.8%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 11,575
- County
- Pontotoc
- School/Daycare
- No
- MCL Violations
- 5
- Monitoring Violations
- 17
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 8 | 2002 |
| Coliform (TCR) | MCL | 5 | 2002 |
| Total Haloacetic Acids (HAA5) | MR | 4 | 2007 |
| TTHM | MR | 4 | 2007 |
| LEAD AND COPPER RULE REVISIONS | TT | 2 | 2024 |
| LEAD AND COPPER RULE REVISIONS | RPT | 2 | 2024 |
| Consumer Confidence Rule | Other | 1 | 2025 |
| E. COLI | MR | 1 | 2010 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 31 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| lithium | 8/7/2024 | <9 µg/L | 9 µg/L | Not Detected |
| PFUnA | 12/20/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFPeS | 12/20/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 12/20/2023 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFEESA | 12/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 12/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 12/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 12/20/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 8:2 FTS | 12/20/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 12/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 12/20/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 12/20/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| HFPO-DA | 12/20/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| ADONA | 12/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 11Cl-PF3OUdS | 12/20/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHxA | 12/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 12/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NMeFOSAA | 12/20/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| NEtFOSAA | 12/20/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTrDA | 12/20/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFTA | 12/20/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| 9Cl-PF3ONS | 12/20/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| lithium | 12/20/2023 | <9 µg/L | 9 µg/L | Not Detected |
| PFDoA | 12/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 12/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 12/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpS | 12/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOS | 12/20/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOA | 12/20/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFDA | 12/20/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFNA | 12/20/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
Verify This Water System
The figures above are aggregated from EPA's public databases. To verify the underlying records — or to file a complaint, request a Consumer Confidence Report, or check current monitoring status — go directly to the federal and state regulators that enforce the Safe Drinking Water Act for ADA.
EPA SDWIS — Federal Reports
EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:
View PWS ID OK2006201 on SDWISSource: EPA SDWIS Federal Reports Search
Oklahoma Drinking Water Authority
Oklahoma's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.
Find OK regulator via EPA SDWISViolation Timeline
Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.
| Year (latest) | Contaminant | Category | Count | EPA Record |
|---|---|---|---|---|
| 2025 | Consumer Confidence Rule | Other | 1 | SDWIS / OK2006201 / 7000 |
| 2024 | LEAD AND COPPER RULE REVISIONS | TT | 2 | SDWIS / OK2006201 / 5200 |
| 2024 | LEAD AND COPPER RULE REVISIONS | RPT | 2 | SDWIS / OK2006201 / 5200 |
| 2010 | E. COLI | MR | 1 | SDWIS / OK2006201 / 3014 |
| 2007 | Total Haloacetic Acids (HAA5) | MR | 4 | SDWIS / OK2006201 / 2456 |
| 2007 | TTHM | MR | 4 | SDWIS / OK2006201 / 2950 |
| 2002 | Coliform (TCR) | MR | 8 | SDWIS / OK2006201 / 3100 |
| 2002 | Coliform (TCR) | MCL | 5 | SDWIS / OK2006201 / 3100 |
How ADA Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | ADA | Oklahoma avg | Federal benchmark |
|---|---|---|---|
| Total violations | 34 | 266.8 | SDWA compliance — any non-zero count is a recorded breach |
| Health-based violations | 7 | 90.2 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | None | 60.8% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 22,600 | 2,931 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,262 regulated public water systems in Oklahoma.
Federal MCL reference — Safe Drinking Water Act thresholds ▼
| Contaminant | Federal MCL / Action Level | Note |
|---|---|---|
| Lead | 0 mg/L (Action Level: 0.015 mg/L) | Lead and Copper Rule treatment technique |
| Arsenic | 0.010 mg/L (10 ppb) | Health-based MCL since 2006 |
| Total Coliform | Treatment technique (RTCR) | Indicator organism, monitoring trigger |
| PFOA / PFOS (PFAS) | 4.0 ppt each (final 2024 rule) | Compliance deadline 2029 |
| Nitrate (as N) | 10 mg/L | Acute health risk for infants |
Frequently Asked Questions
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Related Data for Oklahoma
Read our methodology — how this data is sourced, computed, and verified.