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Community Water System · PWS ID2350011

Lapwai City Of

Lapwai, Idaho 83540 - drinking water served from groundwater sources to 325 people, tracked in EPA SDWIS and UCMR5.

325
People served
66
EPA violations
9
Health-based
Untested
UCMR5 result

The verdict

EPA records 66 drinking-water violations at Lapwai City Of, 14% of them health-based - above the Idaho per-system average.

66
Total EPA violations on record
14%
Health-based (MCL / treatment failure)
325
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Lapwai City Of

Lapwai City Of is a local-owned community water system that delivers drinking water to 325 residents in Lapwai, Idaho (Nez Perce County) through 332 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 66 total violations for this system , of which 9 (14%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 54 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 9 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. Statewide, 40 of 60 UCMR5-tested systems have reported PFAS detections (66.7%).

Lapwai City Of's 66 violations sit above the Idaho average.

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
325
Total Violations
66
Health-Based Violations
9
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
332
County
Nez Perce
School/Daycare
No
MCL Violations
9
Monitoring Violations
54
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 9 2004
Chlorine MR 8 2022
Coliform (TCR) MR 6 2011
Revised Total Coliform Rule MON 6 2022
Public Notice Other 3 2011
Cadmium MR 3 2020
Chromium MR 3 2020
Mercury MR 3 2020
Antimony, Total MR 3 2020
Thallium, Total MR 3 2020
Beryllium, Total MR 3 2020
E. COLI MR 3 2025
Selenium MR 3 2020
Barium MR 3 2020
Nickel MR 3 2020
TTHM MR 1 2005
Total Haloacetic Acids (HAA5) MR 1 2005
Nitrate MR 1 1996
Gross Alpha, Excl. Radon and U MR 1 1979

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 Lapwai City Of.

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 ID2350011 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
2025 E. COLI MR 3 SDWIS / ID2350011 / 3014
2022 Chlorine MR 8 SDWIS / ID2350011 / 0999
2022 Revised Total Coliform Rule MON 6 SDWIS / ID2350011 / 8000
2020 Cadmium MR 3 SDWIS / ID2350011 / 1015
2020 Chromium MR 3 SDWIS / ID2350011 / 1020
2020 Mercury MR 3 SDWIS / ID2350011 / 1035
2020 Antimony, Total MR 3 SDWIS / ID2350011 / 1074
2020 Thallium, Total MR 3 SDWIS / ID2350011 / 1085
2020 Beryllium, Total MR 3 SDWIS / ID2350011 / 1075
2020 Selenium MR 3 SDWIS / ID2350011 / 1045
2020 Barium MR 3 SDWIS / ID2350011 / 1010
2020 Nickel MR 3 SDWIS / ID2350011 / 1036
2011 Coliform (TCR) MR 6 SDWIS / ID2350011 / 3100
2011 Public Notice Other 3 SDWIS / ID2350011 / 7500
2005 TTHM MR 1 SDWIS / ID2350011 / 2950

How Lapwai City Of Compares

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

Metric Lapwai City Of Idaho avg Federal benchmark
Total violations 66 52.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 9 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 325 870 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 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Lapwai City Of water safe to drink? ▼
Lapwai City Of (PWS ID: ID2350011) has 66 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 325 people using Groundwater sources.
How many people does Lapwai City Of serve? ▼
Lapwai City Of serves 325 people in Lapwai, Idaho. It is a Local-owned system using Groundwater water sources with 332 service connections.
What type of violations does Lapwai City Of have? ▼
Lapwai City Of has 66 total violations: 9 health-based violations (MCL exceedances or treatment failures), 54 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Lapwai City Of water? ▼
No PFAS testing data is available for Lapwai City Of under the EPA's UCMR5 monitoring program.
What water source does Lapwai City Of use? ▼
Lapwai City Of 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.
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.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.