CHALLIS CITY OF
PWS ID: ID7190013 · CHALLIS, Idaho 83226
CHALLIS CITY OF serves 900 people in CHALLIS, Idaho using Surface Water water sources. It has 191 recorded EPA violations, including 3 health-based violations. No PFAS contamination was detected in UCMR5 testing.
Water Quality Snapshot: CHALLIS CITY OF
CHALLIS CITY OF is a local-owned community water system that delivers drinking water to 900 residents in CHALLIS, Idaho (Custer County) through 566 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 191 total violations for this system , of which 3 (2%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 182 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.
The most frequently cited contaminant at this system is CARBON, TOTAL, recorded in 17 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 Idaho, EPA tracks 2,005 public water systems serving 1,743,912 people, with 104,850 cumulative violations and 19,965 health-based violations on record. About 96% of systems in the state carry at least one violation, and state-wide the average per system is 52.3 violations. CHALLIS CITY OF's 191 violations sit above the Idaho average. Statewide, 40 of 60 UCMR5-tested systems have reported PFAS detections (66.7%). 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
- 566
- County
- Custer
- School/Daycare
- No
- MCL Violations
- 3
- Monitoring Violations
- 182
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| CARBON, TOTAL | MR | 17 | 2024 |
| Nitrate | MR | 13 | 2019 |
| Revised Total Coliform Rule | MON | 12 | 2024 |
| Coliform (TCR) | MR | 10 | 2010 |
| Surface Water Treatment Rule | MR | 6 | 2023 |
| Arsenic | MR | 5 | 2017 |
| Lead and Copper Rule | MR | 4 | 2020 |
| Chromium | MR | 3 | 2011 |
| Nickel | MR | 3 | 2011 |
| Beryllium, Total | MR | 3 | 2011 |
| Selenium | MR | 3 | 2011 |
| Fluoride | MR | 3 | 2011 |
| 1,2,4-Trichlorobenzene | MR | 3 | 2019 |
| cis-1,2-Dichloroethylene | MR | 3 | 2019 |
| Xylenes, Total | MR | 3 | 2019 |
| p-Dichlorobenzene | MR | 3 | 2019 |
| Vinyl chloride | MR | 3 | 2019 |
| 1,1-Dichloroethylene | MR | 3 | 2019 |
| 1,2-Dichloroethane | MR | 3 | 2019 |
| 1,1,1-Trichloroethane | MR | 3 | 2019 |
| Carbon tetrachloride | MR | 3 | 2019 |
| 1,2-Dichloropropane | MR | 3 | 2019 |
| Trichloroethylene | MR | 3 | 2019 |
| Tetrachloroethylene | MR | 3 | 2019 |
| CHLOROBENZENE | MR | 3 | 2019 |
| Toluene | MR | 3 | 2019 |
| Ethylbenzene | MR | 3 | 2019 |
| Styrene | MR | 3 | 2019 |
| Gross Alpha, Excl. Radon and U | MR | 3 | 2017 |
| Interim Enhanced Surface Water Treatment Rule | 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 CHALLIS CITY OF.
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 ID7190013 on SDWISSource: EPA SDWIS Federal Reports Search
Idaho Drinking Water Authority
Idaho'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 ID 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 |
|---|---|---|---|---|
| 2024 | CARBON, TOTAL | MR | 17 | SDWIS / ID7190013 / 2920 |
| 2024 | Revised Total Coliform Rule | MON | 12 | SDWIS / ID7190013 / 8000 |
| 2023 | Surface Water Treatment Rule | MR | 6 | SDWIS / ID7190013 / 0200 |
| 2023 | Chlorine | MR | 3 | SDWIS / ID7190013 / 0999 |
| 2022 | Interim Enhanced Surface Water Treatment Rule | MR | 3 | SDWIS / ID7190013 / 0300 |
| 2020 | Lead and Copper Rule | MR | 4 | SDWIS / ID7190013 / 5000 |
| 2019 | Nitrate | MR | 13 | SDWIS / ID7190013 / 1040 |
| 2019 | 1,2,4-Trichlorobenzene | MR | 3 | SDWIS / ID7190013 / 2378 |
| 2019 | cis-1,2-Dichloroethylene | MR | 3 | SDWIS / ID7190013 / 2380 |
| 2019 | Xylenes, Total | MR | 3 | SDWIS / ID7190013 / 2955 |
| 2019 | p-Dichlorobenzene | MR | 3 | SDWIS / ID7190013 / 2969 |
| 2019 | Vinyl chloride | MR | 3 | SDWIS / ID7190013 / 2976 |
| 2019 | 1,1-Dichloroethylene | MR | 3 | SDWIS / ID7190013 / 2977 |
| 2019 | 1,2-Dichloroethane | MR | 3 | SDWIS / ID7190013 / 2980 |
| 2019 | 1,1,1-Trichloroethane | MR | 3 | SDWIS / ID7190013 / 2981 |
How CHALLIS CITY OF Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | CHALLIS CITY OF | Idaho avg | Federal benchmark |
|---|---|---|---|
| Total violations | 191 | 52.3 | SDWA compliance — any non-zero count is a recorded breach |
| Health-based violations | 3 | 10 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | None | 66.7% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 900 | 870 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,005 regulated public water systems in Idaho.
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 Idaho
Read our methodology — how this data is sourced, computed, and verified.