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SOUTH LAPWAI

PWS ID: 101600003 · LAPWAI, 10 83540

SOUTH LAPWAI serves 235 people in LAPWAI, 10 using Groundwater water sources. It has 121 recorded EPA violations, including 8 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: SOUTH LAPWAI

SOUTH LAPWAI is a native american-owned community water system that delivers drinking water to 235 residents in LAPWAI, 10 through 64 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 121 total violations for this system , of which 8 (7%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 101 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 37 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 10, EPA tracks 158 public water systems serving 142,574 people, with 31,953 cumulative violations and 1,055 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 202.2 violations. SOUTH LAPWAI's 121 violations sit below the 10 average. Statewide, 2 of 10 UCMR5-tested systems have reported PFAS detections (20%). 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
235
Total Violations
121
Health-Based Violations
8
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
64
School/Daycare
No
MCL Violations
8
Monitoring Violations
101
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 37 2014
Consumer Confidence Rule Other 10 2017
Coliform (TCR) MCL 8 2008
Nitrate MR 6 2023
Lead and Copper Rule MR 6 2016
Chlorine MR 4 2010
TTHM MR 2 2008
Nickel MR 2 2008
Antimony, Total MR 2 2008
Asbestos MR 2 2008
Thallium, Total MR 2 2008
Beryllium, Total MR 2 2008
Total Haloacetic Acids (HAA5) MR 2 2008
CYANIDE MR 2 2008
DICHLOROMETHANE MR 1 2005
1,1-Dichloroethylene MR 1 2005
1,2-Dichloroethane MR 1 2005
1,1,1-Trichloroethane MR 1 2005
Carbon tetrachloride MR 1 2005
Tetrachloroethylene MR 1 2005
Toluene MR 1 2005
Styrene MR 1 2005
Fluoride MR 1 2005
Chromium MR 1 2005
Mercury MR 1 2005
Selenium MR 1 2005
Arsenic MR 1 2005
2,3,7,8-TCDD MR 1 2008
Gross Alpha, Excl. Radon and U MR 1 2014
Combined Uranium MR 1 2014

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 SOUTH LAPWAI.

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 101600003 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

10 Drinking Water Authority

10'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 10 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
2023 Nitrate MR 6 SDWIS / 101600003 / 1040
2017 Consumer Confidence Rule Other 10 SDWIS / 101600003 / 7000
2016 Lead and Copper Rule MR 6 SDWIS / 101600003 / 5000
2014 Coliform (TCR) MR 37 SDWIS / 101600003 / 3100
2014 Gross Alpha, Excl. Radon and U MR 1 SDWIS / 101600003 / 4000
2014 Combined Uranium MR 1 SDWIS / 101600003 / 4006
2014 Combined Radium (-226 and -228) MR 1 SDWIS / 101600003 / 4010
2010 Chlorine MR 4 SDWIS / 101600003 / 0999
2008 Coliform (TCR) MCL 8 SDWIS / 101600003 / 3100
2008 TTHM MR 2 SDWIS / 101600003 / 2950
2008 Nickel MR 2 SDWIS / 101600003 / 1036
2008 Antimony, Total MR 2 SDWIS / 101600003 / 1074
2008 Asbestos MR 2 SDWIS / 101600003 / 1094
2008 Thallium, Total MR 2 SDWIS / 101600003 / 1085
2008 Beryllium, Total MR 2 SDWIS / 101600003 / 1075

How SOUTH LAPWAI Compares

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

Metric SOUTH LAPWAI 10 avg Federal benchmark
Total violations 121 202.2 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 8 6.7 Indicates a contaminant exceeded a federal MCL
PFAS detection None 20% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 235 902 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 158 regulated public water systems in 10.

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 SOUTH LAPWAI water safe to drink? ▼
SOUTH LAPWAI (PWS ID: 101600003) has 121 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 235 people using Groundwater sources.
How many people does SOUTH LAPWAI serve? ▼
SOUTH LAPWAI serves 235 people in LAPWAI, 10. It is a Native American-owned system using Groundwater water sources with 64 service connections.
What type of violations does SOUTH LAPWAI have? ▼
SOUTH LAPWAI has 121 total violations: 8 health-based violations (MCL exceedances or treatment failures), 101 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in SOUTH LAPWAI water? ▼
No PFAS testing data is available for SOUTH LAPWAI under the EPA's UCMR5 monitoring program.
What water source does SOUTH LAPWAI use? ▼
SOUTH LAPWAI 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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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by PlainWater Editorial