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WINCHESTER WATER DEPT

PWS ID: ID2310007 · WINCHESTER, Idaho 83555

WINCHESTER WATER DEPT serves 400 people in WINCHESTER, Idaho using Groundwater water sources. It has 90 recorded EPA violations, including 16 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: WINCHESTER WATER DEPT

WINCHESTER WATER DEPT is a local-owned community water system that delivers drinking water to 400 residents in WINCHESTER, Idaho (Lewis County) through 217 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 90 total violations for this system , of which 16 (18%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 69 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 Coliform (TCR), recorded in 16 violations (MCL, health-based). 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. WINCHESTER WATER DEPT's 90 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.

Population Served
400
Total Violations
90
Health-Based Violations
16
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
217
County
Lewis
School/Daycare
No
MCL Violations
16
Monitoring Violations
69
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 16 2015
Lead and Copper Rule MR 7 2024
Chlorine MR 5 2017
Revised Total Coliform Rule MON 3 2017
Cadmium MR 3 2020
Mercury MR 3 2020
Antimony, Total MR 3 2020
Thallium, Total MR 3 2020
Selenium MR 3 2020
Fluoride MR 3 2020
Nitrate MR 3 2022
Gross Alpha, Excl. Radon and U MR 3 2017
Barium MR 3 2020
Beryllium, Total MR 3 2020
Nitrite MR 3 2020
Arsenic MR 3 2020
Nickel MR 3 2020
Chromium MR 3 2020
TTHM MR 2 2018
Radium-226 MR 2 2017
Radium-228 MR 2 2017
Combined Uranium MR 2 2017
Coliform (TCR) MR 2 1992
Total Haloacetic Acids (HAA5) MR 2 2018

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 WINCHESTER WATER DEPT.

Federal Source of Truth

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 ID2310007 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

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 SDWIS

Violation 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 Lead and Copper Rule MR 7 SDWIS / ID2310007 / 5000
2022 Nitrate MR 3 SDWIS / ID2310007 / 1040
2020 Cadmium MR 3 SDWIS / ID2310007 / 1015
2020 Mercury MR 3 SDWIS / ID2310007 / 1035
2020 Antimony, Total MR 3 SDWIS / ID2310007 / 1074
2020 Thallium, Total MR 3 SDWIS / ID2310007 / 1085
2020 Selenium MR 3 SDWIS / ID2310007 / 1045
2020 Fluoride MR 3 SDWIS / ID2310007 / 1025
2020 Barium MR 3 SDWIS / ID2310007 / 1010
2020 Beryllium, Total MR 3 SDWIS / ID2310007 / 1075
2020 Nitrite MR 3 SDWIS / ID2310007 / 1041
2020 Arsenic MR 3 SDWIS / ID2310007 / 1005
2020 Nickel MR 3 SDWIS / ID2310007 / 1036
2020 Chromium MR 3 SDWIS / ID2310007 / 1020
2018 TTHM MR 2 SDWIS / ID2310007 / 2950

How WINCHESTER WATER DEPT Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric WINCHESTER WATER DEPT Idaho avg Federal benchmark
Total violations 90 52.3 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 16 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 400 870 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

Is WINCHESTER WATER DEPT water safe to drink? ▼
WINCHESTER WATER DEPT (PWS ID: ID2310007) has 90 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 400 people using Groundwater sources.
How many people does WINCHESTER WATER DEPT serve? ▼
WINCHESTER WATER DEPT serves 400 people in WINCHESTER, Idaho. It is a Local-owned system using Groundwater water sources with 217 service connections.
What type of violations does WINCHESTER WATER DEPT have? ▼
WINCHESTER WATER DEPT has 90 total violations: 16 health-based violations (MCL exceedances or treatment failures), 69 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in WINCHESTER WATER DEPT water? ▼
No PFAS testing data is available for WINCHESTER WATER DEPT under the EPA's UCMR5 monitoring program.
What water source does WINCHESTER WATER DEPT use? ▼
WINCHESTER WATER DEPT uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

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Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology — how this data is sourced, computed, and verified.

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