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WYMOSA WATER ASSN INC

PWS ID: ID4010161 · BOISE, Idaho 83703

WYMOSA WATER ASSN INC serves 280 people in BOISE, Idaho using Groundwater water sources. It has 397 recorded EPA violations, including 8 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: WYMOSA WATER ASSN INC

WYMOSA WATER ASSN INC is a private-owned community water system that delivers drinking water to 280 residents in BOISE, Idaho (Ada County) through 84 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 397 total violations for this system , of which 8 (2%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 385 monitoring and reporting violations are on file. The most recent violation on record dates to 2021.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 38 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. WYMOSA WATER ASSN INC's 397 violations sit above the Idaho average. Statewide, 40 of 60 UCMR5-tested systems have reported PFAS detections (66.7%). 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
280
Total Violations
397
Health-Based Violations
8
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
84
County
Ada
School/Daycare
No
MCL Violations
8
Monitoring Violations
385
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 38 2001
Lead and Copper Rule MR 29 2021
Nitrate MR 11 1999
Coliform (TCR) MCL 8 2009
Benzene MR 6 1993
1,1-Dichloroethylene MR 6 1993
cis-1,2-Dichloroethylene MR 6 1993
trans-1,2-Dichloroethylene MR 6 1993
1,2-Dichloropropane MR 6 1993
CHLOROBENZENE MR 6 1993
Tetrachloroethylene MR 6 1993
Toluene MR 6 1993
ETHYLENE DIBROMIDE MR 6 1993
1,2-DIBROMO-3-CHLOROPROPANE MR 6 1993
LASSO MR 6 1993
Atrazine MR 6 1993
Heptachlor MR 6 1993
Heptachlor epoxide MR 6 1993
Methoxychlor MR 6 1993
Total Polychlorinated Biphenyls (PCB) MR 6 1993
2,4-D MR 6 1993
Carbofuran MR 6 1993
2,4,5-TP MR 6 1993
Carbon tetrachloride MR 6 1993
1,2-Dichloroethane MR 6 1993
Trichloroethylene MR 6 1993
Pentachlorophenol MR 6 1993
o-Dichlorobenzene MR 6 1993
1,1,1-Trichloroethane MR 6 1993
Xylenes, Total MR 6 1993

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 WYMOSA WATER ASSN INC.

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 ID4010161 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
2021 Lead and Copper Rule MR 29 SDWIS / ID4010161 / 5000
2017 Revised Total Coliform Rule MON 3 SDWIS / ID4010161 / 8000
2009 Coliform (TCR) MCL 8 SDWIS / ID4010161 / 3100
2001 Coliform (TCR) MR 38 SDWIS / ID4010161 / 3100
1999 Nitrate MR 11 SDWIS / ID4010161 / 1040
1999 Consumer Confidence Rule Other 2 SDWIS / ID4010161 / 7000
1993 Benzene MR 6 SDWIS / ID4010161 / 2990
1993 1,1-Dichloroethylene MR 6 SDWIS / ID4010161 / 2977
1993 cis-1,2-Dichloroethylene MR 6 SDWIS / ID4010161 / 2380
1993 trans-1,2-Dichloroethylene MR 6 SDWIS / ID4010161 / 2979
1993 1,2-Dichloropropane MR 6 SDWIS / ID4010161 / 2983
1993 CHLOROBENZENE MR 6 SDWIS / ID4010161 / 2989
1993 Tetrachloroethylene MR 6 SDWIS / ID4010161 / 2987
1993 Toluene MR 6 SDWIS / ID4010161 / 2991
1993 ETHYLENE DIBROMIDE MR 6 SDWIS / ID4010161 / 2946

How WYMOSA WATER ASSN INC Compares

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

Metric WYMOSA WATER ASSN INC Idaho avg Federal benchmark
Total violations 397 52.3 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 8 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 280 870 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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is WYMOSA WATER ASSN INC water safe to drink? ▼
WYMOSA WATER ASSN INC (PWS ID: ID4010161) has 397 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 280 people using Groundwater sources.
How many people does WYMOSA WATER ASSN INC serve? ▼
WYMOSA WATER ASSN INC serves 280 people in BOISE, Idaho. It is a Private-owned system using Groundwater water sources with 84 service connections.
What type of violations does WYMOSA WATER ASSN INC have? ▼
WYMOSA WATER ASSN INC has 397 total violations: 8 health-based violations (MCL exceedances or treatment failures), 385 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in WYMOSA WATER ASSN INC water? ▼
No PFAS testing data is available for WYMOSA WATER ASSN INC under the EPA's UCMR5 monitoring program.
What water source does WYMOSA WATER ASSN INC use? ▼
WYMOSA WATER ASSN INC 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.

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