HINCKLEY
PWS ID: 055294305 · ONAMIA, 05 56359
HINCKLEY serves 400 people in ONAMIA, 05 using Groundwater water sources. It has 280 recorded EPA violations, including 0 health-based violations. No PFAS contamination was detected in UCMR5 testing.
Water Quality Snapshot: HINCKLEY
HINCKLEY is a native american-owned community water system that delivers drinking water to 400 residents in ONAMIA, 05 through 90 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 280 total violations for this system , of which 0 (0%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 279 monitoring and reporting violations are on file. The most recent violation on record dates to 2022.
The most frequently cited contaminant at this system is trans-1,2-Dichloroethylene, recorded in 9 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.
Across 05, EPA tracks 113 public water systems serving 144,290 people, with 19,546 cumulative violations and 443 health-based violations on record. About 95% of systems in the state carry at least one violation, and state-wide the average per system is 173 violations. HINCKLEY's 280 violations sit above the 05 average. Statewide, 5 of 13 UCMR5-tested systems have reported PFAS detections (38.5%). 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
- Native American
- Connections
- 90
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 279
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| trans-1,2-Dichloroethylene | MR | 9 | 2022 |
| Carbon tetrachloride | MR | 9 | 2022 |
| 1,1,1-Trichloroethane | MR | 9 | 2022 |
| 1,2-Dichloropropane | MR | 9 | 2022 |
| CHLOROBENZENE | MR | 9 | 2022 |
| 1,2,4-Trichlorobenzene | MR | 9 | 2022 |
| Toluene | MR | 9 | 2022 |
| Ethylbenzene | MR | 9 | 2022 |
| cis-1,2-Dichloroethylene | MR | 9 | 2022 |
| Xylenes, Total | MR | 9 | 2022 |
| o-Dichlorobenzene | MR | 9 | 2022 |
| p-Dichlorobenzene | MR | 9 | 2022 |
| Vinyl chloride | MR | 9 | 2022 |
| 1,2-Dichloroethane | MR | 9 | 2022 |
| 1,1,2-Trichloroethane | MR | 9 | 2022 |
| Tetrachloroethylene | MR | 9 | 2022 |
| Benzene | MR | 9 | 2022 |
| DICHLOROMETHANE | MR | 9 | 2022 |
| 1,1-Dichloroethylene | MR | 9 | 2022 |
| Trichloroethylene | MR | 9 | 2022 |
| Styrene | MR | 9 | 2022 |
| BHC-GAMMA | MR | 3 | 2022 |
| Toxaphene | MR | 3 | 2022 |
| Diquat | MR | 3 | 2022 |
| Endothall | MR | 3 | 2022 |
| Glyphosate | MR | 3 | 2022 |
| Di(2-ethylhexyl) adipate | MR | 3 | 2022 |
| Di(2-ethylhexyl) phthalate | MR | 3 | 2022 |
| Picloram | MR | 3 | 2022 |
| Dinoseb | MR | 3 | 2022 |
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 HINCKLEY.
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 055294305 on SDWISSource: EPA SDWIS Federal Reports Search
05 Drinking Water Authority
05'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 05 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 |
|---|---|---|---|---|
| 2022 | trans-1,2-Dichloroethylene | MR | 9 | SDWIS / 055294305 / 2979 |
| 2022 | Carbon tetrachloride | MR | 9 | SDWIS / 055294305 / 2982 |
| 2022 | 1,1,1-Trichloroethane | MR | 9 | SDWIS / 055294305 / 2981 |
| 2022 | 1,2-Dichloropropane | MR | 9 | SDWIS / 055294305 / 2983 |
| 2022 | CHLOROBENZENE | MR | 9 | SDWIS / 055294305 / 2989 |
| 2022 | 1,2,4-Trichlorobenzene | MR | 9 | SDWIS / 055294305 / 2378 |
| 2022 | Toluene | MR | 9 | SDWIS / 055294305 / 2991 |
| 2022 | Ethylbenzene | MR | 9 | SDWIS / 055294305 / 2992 |
| 2022 | cis-1,2-Dichloroethylene | MR | 9 | SDWIS / 055294305 / 2380 |
| 2022 | Xylenes, Total | MR | 9 | SDWIS / 055294305 / 2955 |
| 2022 | o-Dichlorobenzene | MR | 9 | SDWIS / 055294305 / 2968 |
| 2022 | p-Dichlorobenzene | MR | 9 | SDWIS / 055294305 / 2969 |
| 2022 | Vinyl chloride | MR | 9 | SDWIS / 055294305 / 2976 |
| 2022 | 1,2-Dichloroethane | MR | 9 | SDWIS / 055294305 / 2980 |
| 2022 | 1,1,2-Trichloroethane | MR | 9 | SDWIS / 055294305 / 2985 |
How HINCKLEY Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | HINCKLEY | 05 avg | Federal benchmark |
|---|---|---|---|
| Total violations | 280 | 173 | SDWA compliance — any non-zero count is a recorded breach |
| Health-based violations | 0 | 3.9 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | None | 38.5% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 400 | 1,277 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 113 regulated public water systems in 05.
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 05
Read our methodology — how this data is sourced, computed, and verified.