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TWENTY MILE CREEK WATER ASSN

PWS ID: ID1110030 · BONNERS FERRY, Idaho 83805

TWENTY MILE CREEK WATER ASSN serves 225 people in BONNERS FERRY, Idaho using Surface Water water sources. It has 135 recorded EPA violations, including 106 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: TWENTY MILE CREEK WATER ASSN

TWENTY MILE CREEK WATER ASSN is a private-owned community water system that delivers drinking water to 225 residents in BONNERS FERRY, Idaho (Boundary County) through 89 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 135 total violations for this system , of which 106 (79%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 21 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Surface Water Treatment Rule, recorded in 85 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. TWENTY MILE CREEK WATER ASSN's 135 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
225
Total Violations
135
Health-Based Violations
106
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Private
Connections
89
County
Boundary
School/Daycare
No
MCL Violations
8
Monitoring Violations
21
Treatment Tech Violations
98

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Surface Water Treatment Rule TT 85 2000
Interim Enhanced Surface Water Treatment Rule TT 13 2018
TTHM MCL 6 2024
Coliform (TCR) MR 5 2002
Nitrate MR 2 2000
Coliform (TCR) MCL 2 2002
2,4-D MR 1 1979
2,4,5-TP MR 1 1979
Barium MR 1 1979
Cadmium MR 1 1979
Chromium MR 1 1979
Endrin MR 1 1979
Toxaphene MR 1 1979
Arsenic MR 1 1979
Selenium MR 1 1979
Gross Alpha, Excl. Radon and U MR 1 1979
Methoxychlor MR 1 1979
Mercury MR 1 1979
BHC-GAMMA MR 1 1979
Fluoride MR 1 1979

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 TWENTY MILE CREEK 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 ID1110030 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
2024 TTHM MCL 6 SDWIS / ID1110030 / 2950
2018 Interim Enhanced Surface Water Treatment Rule TT 13 SDWIS / ID1110030 / 0300
2002 Coliform (TCR) MR 5 SDWIS / ID1110030 / 3100
2002 Coliform (TCR) MCL 2 SDWIS / ID1110030 / 3100
2000 Surface Water Treatment Rule TT 85 SDWIS / ID1110030 / 0200
2000 Nitrate MR 2 SDWIS / ID1110030 / 1040
1979 2,4-D MR 1 SDWIS / ID1110030 / 2105
1979 2,4,5-TP MR 1 SDWIS / ID1110030 / 2110
1979 Barium MR 1 SDWIS / ID1110030 / 1010
1979 Cadmium MR 1 SDWIS / ID1110030 / 1015
1979 Chromium MR 1 SDWIS / ID1110030 / 1020
1979 Endrin MR 1 SDWIS / ID1110030 / 2005
1979 Toxaphene MR 1 SDWIS / ID1110030 / 2020
1979 Arsenic MR 1 SDWIS / ID1110030 / 1005
1979 Selenium MR 1 SDWIS / ID1110030 / 1045

How TWENTY MILE CREEK WATER ASSN Compares

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

Metric TWENTY MILE CREEK WATER ASSN Idaho avg Federal benchmark
Total violations 135 52.3 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 106 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 225 870 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 TWENTY MILE CREEK WATER ASSN water safe to drink? ▼
TWENTY MILE CREEK WATER ASSN (PWS ID: ID1110030) has 135 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 225 people using Surface Water sources.
How many people does TWENTY MILE CREEK WATER ASSN serve? ▼
TWENTY MILE CREEK WATER ASSN serves 225 people in BONNERS FERRY, Idaho. It is a Private-owned system using Surface Water water sources with 89 service connections.
What type of violations does TWENTY MILE CREEK WATER ASSN have? ▼
TWENTY MILE CREEK WATER ASSN has 135 total violations: 106 health-based violations (MCL exceedances or treatment failures), 21 monitoring/reporting violations, and 98 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in TWENTY MILE CREEK WATER ASSN water? ▼
No PFAS testing data is available for TWENTY MILE CREEK WATER ASSN under the EPA's UCMR5 monitoring program.
What water source does TWENTY MILE CREEK WATER ASSN use? ▼
TWENTY MILE CREEK WATER ASSN uses Surface Water 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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