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States → EPA Region 10 — Tribal Water Systems

Community Water System · PWS 105300033

Malott

Nespelem, EPA Region 10 — Tribal Water Systems 99155 - drinking water served from groundwater sources to 95 people, tracked in EPA SDWIS and UCMR5.

95
People served
545
EPA violations
6
Health-based
Untested
UCMR5 result

The verdict

EPA records 545 drinking-water violations at Malott, 1% of them health-based.

545
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
95
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Malott

Malott is a native american-owned community water system that delivers drinking water to 95 residents in Nespelem, EPA Region 10 — Tribal Water Systems through 38 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 545 total violations for this system , of which 6 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 515 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 Nitrate, recorded in 19 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

EPA Region 10 — Tribal Water Systems has thousands of regulated public water systems tracked by EPA under the Safe Drinking Water Act.

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
95
Total Violations
545
Health-Based Violations
6
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
38
School/Daycare
No
MCL Violations
0
Monitoring Violations
515
Treatment Tech Violations
6

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrate MR 19 2023
Consumer Confidence Rule Other 19 2025
Gross Alpha, Excl. Radon and U MR 14 2014
Arsenic MR 9 2024
Coliform (TCR) MR 9 2004
Combined Radium (-226 and -228) MR 9 2014
Combined Uranium MR 9 2014
Atrazine MR 8 2017
Benzene MR 8 2017
Chromium MR 7 2017
CYANIDE MR 7 2017
Fluoride MR 7 2017
Mercury MR 7 2017
Selenium MR 7 2017
Thallium, Total MR 7 2017
Endrin MR 7 2017
Methoxychlor MR 7 2017
BHC-GAMMA MR 7 2017
Toxaphene MR 7 2017
Endothall MR 7 2017
Glyphosate MR 7 2017
Simazine MR 7 2017
Hexachlorocyclopentadiene MR 7 2017
2,3,7,8-TCDD MR 7 2017
Heptachlor MR 7 2017
HEXACHLOROBENZENE MR 7 2017
1,2,4-Trichlorobenzene MR 7 2017
Chlordane MR 7 2017
p-Dichlorobenzene MR 7 2017
trans-1,2-Dichloroethylene MR 7 2017

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 Malott.

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 105300033 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

EPA Region 10 — Tribal Water Systems Drinking Water Authority

EPA Region 10 — Tribal Water Systems'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
2025 Consumer Confidence Rule Other 19 SDWIS / 105300033 / 7000
2025 Public Notice Other 1 SDWIS / 105300033 / 7500
2024 Arsenic MR 9 SDWIS / 105300033 / 1005
2024 LEAD AND COPPER RULE REVISIONS TT 1 SDWIS / 105300033 / 5200
2023 Nitrate MR 19 SDWIS / 105300033 / 1040
2023 Chlorine MR 7 SDWIS / 105300033 / 0999
2023 Groundwater Rule TT 5 SDWIS / 105300033 / 0700
2023 Revised Total Coliform Rule RPT 1 SDWIS / 105300033 / 8000
2020 Asbestos MR 5 SDWIS / 105300033 / 1094
2020 Lead and Copper Rule MR 4 SDWIS / 105300033 / 5000
2017 Atrazine MR 8 SDWIS / 105300033 / 2050
2017 Benzene MR 8 SDWIS / 105300033 / 2990
2017 Chromium MR 7 SDWIS / 105300033 / 1020
2017 CYANIDE MR 7 SDWIS / 105300033 / 1024
2017 Fluoride MR 7 SDWIS / 105300033 / 1025

How Malott Compares

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

Metric Malott EPA Region 10 — Tribal Water Systems avg Federal benchmark
Total violations 545 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 6 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 95 - Sizing context for compliance burden

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

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 Malott water safe to drink? ▼
Malott (PWS ID: 105300033) has 545 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 95 people using Groundwater sources.
How many people does Malott serve? ▼
Malott serves 95 people in Nespelem, EPA Region 10 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 38 service connections.
What type of violations does Malott have? ▼
Malott has 545 total violations: 6 health-based violations (MCL exceedances or treatment failures), 515 monitoring/reporting violations, and 6 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Malott water? ▼
No PFAS testing data is available for Malott under the EPA's UCMR5 monitoring program.
What water source does Malott use? ▼
Malott 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.