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Transient Non-Community Water System · PWS ID2350016

Lewiston Roundup

Lewiston, Idaho 83501 - drinking water served from groundwater sources to 50 people, tracked in EPA SDWIS and UCMR5.

50
People served
232
EPA violations
111
Health-based
Untested
UCMR5 result

The verdict

EPA records 232 drinking-water violations at Lewiston Roundup, 48% of them health-based - above the Idaho per-system average.

232
Total EPA violations on record
48%
Health-based (MCL / treatment failure)
50
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Lewiston Roundup

Lewiston Roundup is a private-owned transient non-community water system that delivers drinking water to 50 residents in Lewiston, Idaho (Nez Perce County) through 3 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 232 total violations for this system , of which 111 (48%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 118 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 Groundwater Rule, recorded in 49 violations (TT, 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%).

Lewiston Roundup's 232 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
50
Total Violations
232
Health-Based Violations
111
Water Source
Groundwater

System Details

System Type
Transient Non-Community
Owner Type
Private
Connections
3
County
Nez Perce
School/Daycare
No
MCL Violations
39
Monitoring Violations
118
Treatment Tech Violations
72

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Groundwater Rule TT 49 2022
Groundwater Rule MR 36 2022
Coliform (TCR) MCL 28 2015
Revised Total Coliform Rule MON 28 2020
Chlorine MR 20 2022
E. COLI MR 13 2017
Revised Total Coliform Rule TT 12 2016
Coliform (TCR) MR 12 2014
Surface Water Treatment Rule TT 11 2022
Nitrate MR 9 2022
Revised Total Coliform Rule MCL 6 2019
Nitrate MCL 5 2025
Public Notice Other 2 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 Lewiston Roundup.

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 ID2350016 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 Nitrate MCL 5 SDWIS / ID2350016 / 1040
2022 Groundwater Rule TT 49 SDWIS / ID2350016 / 0700
2022 Groundwater Rule MR 36 SDWIS / ID2350016 / 0700
2022 Chlorine MR 20 SDWIS / ID2350016 / 0999
2022 Surface Water Treatment Rule TT 11 SDWIS / ID2350016 / 0200
2022 Nitrate MR 9 SDWIS / ID2350016 / 1040
2022 Public Notice Other 2 SDWIS / ID2350016 / 7500
2020 Revised Total Coliform Rule MON 28 SDWIS / ID2350016 / 8000
2019 Revised Total Coliform Rule MCL 6 SDWIS / ID2350016 / 8000
2017 E. COLI MR 13 SDWIS / ID2350016 / 3014
2016 Revised Total Coliform Rule TT 12 SDWIS / ID2350016 / 8000
2015 Coliform (TCR) MCL 28 SDWIS / ID2350016 / 3100
2014 Coliform (TCR) MR 12 SDWIS / ID2350016 / 3100

How Lewiston Roundup Compares

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

Metric Lewiston Roundup Idaho avg Federal benchmark
Total violations 232 52.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 111 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 50 870 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 Lewiston Roundup water safe to drink? ▼
Lewiston Roundup (PWS ID: ID2350016) has 232 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 50 people using Groundwater sources.
How many people does Lewiston Roundup serve? ▼
Lewiston Roundup serves 50 people in Lewiston, Idaho. It is a Private-owned system using Groundwater water sources with 3 service connections.
What type of violations does Lewiston Roundup have? ▼
Lewiston Roundup has 232 total violations: 111 health-based violations (MCL exceedances or treatment failures), 118 monitoring/reporting violations, and 72 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Lewiston Roundup water? ▼
No PFAS testing data is available for Lewiston Roundup under the EPA's UCMR5 monitoring program.
What water source does Lewiston Roundup use? ▼
Lewiston Roundup uses Groundwater as its primary water source. It is classified as a Transient Non-Community Water System, serving transient populations.
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.