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Community Water System · PWS ID5270025

Unit 3 Water Assn

Jerome, Idaho 83338 - drinking water served from groundwater sources to 350 people, tracked in EPA SDWIS and UCMR5.

350
People served
183
EPA violations
17
Health-based
Untested
UCMR5 result

The verdict

EPA records 183 drinking-water violations at Unit 3 Water Assn, 9% of them health-based - above the Idaho per-system average.

183
Total EPA violations on record
9%
Health-based (MCL / treatment failure)
350
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Unit 3 Water Assn

Unit 3 Water Assn is a private-owned community water system that delivers drinking water to 350 residents in Jerome, Idaho (Jerome County) through 95 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 183 total violations for this system , of which 17 (9%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 149 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 Chlorine, recorded in 61 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 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%).

Unit 3 Water Assn's 183 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
350
Total Violations
183
Health-Based Violations
17
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
95
County
Jerome
School/Daycare
No
MCL Violations
5
Monitoring Violations
149
Treatment Tech Violations
12

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Chlorine MR 61 2024
Revised Total Coliform Rule MON 34 2024
Coliform (TCR) MR 21 2015
Public Notice Other 12 2025
Lead and Copper Rule MR 9 2022
TTHM MR 9 2024
Total Haloacetic Acids (HAA5) MR 9 2024
Groundwater Rule TT 9 2016
Coliform (TCR) MCL 5 2001
Gross Alpha, Excl. Radon and U MR 3 2008
Diquat MR 3 2020
LEAD AND COPPER RULE REVISIONS TT 3 2024
LEAD AND COPPER RULE REVISIONS RPT 3 2024

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 Unit 3 Water Assn.

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 ID5270025 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 Public Notice Other 12 SDWIS / ID5270025 / 7500
2024 Chlorine MR 61 SDWIS / ID5270025 / 0999
2024 Revised Total Coliform Rule MON 34 SDWIS / ID5270025 / 8000
2024 TTHM MR 9 SDWIS / ID5270025 / 2950
2024 Total Haloacetic Acids (HAA5) MR 9 SDWIS / ID5270025 / 2456
2024 LEAD AND COPPER RULE REVISIONS TT 3 SDWIS / ID5270025 / 5200
2024 LEAD AND COPPER RULE REVISIONS RPT 3 SDWIS / ID5270025 / 5200
2022 Lead and Copper Rule MR 9 SDWIS / ID5270025 / 5000
2020 Diquat MR 3 SDWIS / ID5270025 / 2032
2016 Groundwater Rule TT 9 SDWIS / ID5270025 / 0700
2015 Coliform (TCR) MR 21 SDWIS / ID5270025 / 3100
2008 Gross Alpha, Excl. Radon and U MR 3 SDWIS / ID5270025 / 4000
2001 Coliform (TCR) MCL 5 SDWIS / ID5270025 / 3100

How Unit 3 Water Assn Compares

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

Metric Unit 3 Water Assn Idaho avg Federal benchmark
Total violations 183 52.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 17 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 350 870 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 Unit 3 Water Assn water safe to drink? ▼
Unit 3 Water Assn (PWS ID: ID5270025) has 183 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 350 people using Groundwater sources.
How many people does Unit 3 Water Assn serve? ▼
Unit 3 Water Assn serves 350 people in Jerome, Idaho. It is a Private-owned system using Groundwater water sources with 95 service connections.
What type of violations does Unit 3 Water Assn have? ▼
Unit 3 Water Assn has 183 total violations: 17 health-based violations (MCL exceedances or treatment failures), 149 monitoring/reporting violations, and 12 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Unit 3 Water Assn water? ▼
No PFAS testing data is available for Unit 3 Water Assn under the EPA's UCMR5 monitoring program.
What water source does Unit 3 Water Assn use? ▼
Unit 3 Water Assn 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.