TWIN HILLS WATER SYSTEM
PWS ID: AK2260032 · TWIN HILLS, Alaska 99576-8996
TWIN HILLS WATER SYSTEM serves 87 people in TWIN HILLS, Alaska using Groundwater water sources. It has 493 recorded EPA violations, including 57 health-based violations. No PFAS contamination was detected in UCMR5 testing.
Water Quality Snapshot: TWIN HILLS WATER SYSTEM
TWIN HILLS WATER SYSTEM is a native american-owned community water system that delivers drinking water to 87 residents in TWIN HILLS, Alaska (Dillingham Census Area County) through 28 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 493 total violations for this system , of which 57 (12%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 291 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 88 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 Alaska, EPA tracks 1,326 public water systems serving 862,218 people, with 267,144 cumulative violations and 13,963 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 201.5 violations. TWIN HILLS WATER SYSTEM's 493 violations sit above the Alaska average. Statewide, 10 of 30 UCMR5-tested systems have reported PFAS detections (33.3%). 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
- 28
- County
- Dillingham Census Area
- School/Daycare
- No
- MCL Violations
- 9
- Monitoring Violations
- 291
- Treatment Tech Violations
- 48
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 88 | 2013 |
| Groundwater Rule | TT | 48 | 2020 |
| Nitrate | MR | 20 | 2024 |
| Revised Total Coliform Rule | MON | 12 | 2024 |
| Lead and Copper Rule | MR | 9 | 2021 |
| Coliform (TCR) | MCL | 9 | 2006 |
| Consumer Confidence Rule | Other | 5 | 2021 |
| Mercury | MR | 4 | 1999 |
| p-Dichlorobenzene | MR | 4 | 2004 |
| 1,1,1-Trichloroethane | MR | 4 | 2004 |
| Carbon tetrachloride | MR | 4 | 2004 |
| Trichloroethylene | MR | 4 | 2004 |
| Benzene | MR | 4 | 2004 |
| 1,1-Dichloroethylene | MR | 4 | 2004 |
| 1,2-Dichloroethane | MR | 4 | 2004 |
| HEXACHLOROBENZENE | MR | 3 | 2025 |
| Vinyl chloride | MR | 3 | 2004 |
| Heptachlor epoxide | MR | 3 | 2025 |
| 2,4-D | MR | 3 | 2025 |
| Carbofuran | MR | 3 | 2025 |
| Simazine | MR | 3 | 2025 |
| Heptachlor | MR | 3 | 2025 |
| BHC-GAMMA | MR | 3 | 2025 |
| Atrazine | MR | 3 | 2025 |
| 2,4,5-TP | MR | 3 | 2025 |
| Benzo(a)pyrene | MR | 3 | 2025 |
| ETHYLENE DIBROMIDE | MR | 3 | 2025 |
| Endrin | MR | 3 | 2025 |
| Endothall | MR | 3 | 2025 |
| Di(2-ethylhexyl) phthalate | MR | 3 | 2025 |
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 TWIN HILLS WATER SYSTEM.
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 AK2260032 on SDWISSource: EPA SDWIS Federal Reports Search
Alaska Drinking Water Authority
Alaska'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 AK 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 | HEXACHLOROBENZENE | MR | 3 | SDWIS / AK2260032 / 2274 |
| 2025 | Heptachlor epoxide | MR | 3 | SDWIS / AK2260032 / 2067 |
| 2025 | 2,4-D | MR | 3 | SDWIS / AK2260032 / 2105 |
| 2025 | Carbofuran | MR | 3 | SDWIS / AK2260032 / 2046 |
| 2025 | Simazine | MR | 3 | SDWIS / AK2260032 / 2037 |
| 2025 | Heptachlor | MR | 3 | SDWIS / AK2260032 / 2065 |
| 2025 | BHC-GAMMA | MR | 3 | SDWIS / AK2260032 / 2010 |
| 2025 | Atrazine | MR | 3 | SDWIS / AK2260032 / 2050 |
| 2025 | 2,4,5-TP | MR | 3 | SDWIS / AK2260032 / 2110 |
| 2025 | Benzo(a)pyrene | MR | 3 | SDWIS / AK2260032 / 2306 |
| 2025 | ETHYLENE DIBROMIDE | MR | 3 | SDWIS / AK2260032 / 2946 |
| 2025 | Endrin | MR | 3 | SDWIS / AK2260032 / 2005 |
| 2025 | Endothall | MR | 3 | SDWIS / AK2260032 / 2033 |
| 2025 | Di(2-ethylhexyl) phthalate | MR | 3 | SDWIS / AK2260032 / 2039 |
| 2025 | Glyphosate | MR | 3 | SDWIS / AK2260032 / 2034 |
How TWIN HILLS WATER SYSTEM Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | TWIN HILLS WATER SYSTEM | Alaska avg | Federal benchmark |
|---|---|---|---|
| Total violations | 493 | 201.5 | SDWA compliance — any non-zero count is a recorded breach |
| Health-based violations | 57 | 10.5 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | None | 33.3% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 87 | 650 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,326 regulated public water systems in Alaska.
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 Alaska
Read our methodology — how this data is sourced, computed, and verified.