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ARCO CITY OF

PWS ID: ID6120001 · ARCO, Idaho 83213

ARCO CITY OF serves 1,080 people in ARCO, Idaho using Groundwater water sources. It has 60 recorded EPA violations, including 13 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: ARCO CITY OF

ARCO CITY OF is a local-owned community water system that delivers drinking water to 1,080 residents in ARCO, Idaho (Butte County) through 619 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 60 total violations for this system , of which 13 (22%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 45 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 Coliform (TCR), recorded in 14 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. ARCO CITY OF's 60 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
1,080
Total Violations
60
Health-Based Violations
13
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
619
County
Butte
School/Daycare
No
MCL Violations
13
Monitoring Violations
45
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 14 2015
Coliform (TCR) MCL 9 2015
Lead and Copper Rule MR 6 2016
Revised Total Coliform Rule MCL 4 2022
Nitrate MR 2 1996
Barium MR 2 1993
Cadmium MR 2 1993
Chromium MR 2 1993
Antimony, Total MR 2 1993
Nickel MR 2 1993
E. COLI MR 2 2025
Thallium, Total MR 2 1993
Beryllium, Total MR 2 1993
Mercury MR 2 1993
Fluoride MR 2 1993
Selenium MR 2 1993
Di(2-ethylhexyl) phthalate MR 1 2008

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 ARCO CITY OF.

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 ID6120001 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 E. COLI MR 2 SDWIS / ID6120001 / 3014
2022 Revised Total Coliform Rule MCL 4 SDWIS / ID6120001 / 8000
2016 Lead and Copper Rule MR 6 SDWIS / ID6120001 / 5000
2015 Coliform (TCR) MR 14 SDWIS / ID6120001 / 3100
2015 Coliform (TCR) MCL 9 SDWIS / ID6120001 / 3100
2008 Di(2-ethylhexyl) phthalate MR 1 SDWIS / ID6120001 / 2039
1996 Nitrate MR 2 SDWIS / ID6120001 / 1040
1993 Barium MR 2 SDWIS / ID6120001 / 1010
1993 Cadmium MR 2 SDWIS / ID6120001 / 1015
1993 Chromium MR 2 SDWIS / ID6120001 / 1020
1993 Antimony, Total MR 2 SDWIS / ID6120001 / 1074
1993 Nickel MR 2 SDWIS / ID6120001 / 1036
1993 Thallium, Total MR 2 SDWIS / ID6120001 / 1085
1993 Beryllium, Total MR 2 SDWIS / ID6120001 / 1075
1993 Mercury MR 2 SDWIS / ID6120001 / 1035

How ARCO CITY OF Compares

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

Metric ARCO CITY OF Idaho avg Federal benchmark
Total violations 60 52.3 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 13 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 1,080 870 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 ARCO CITY OF water safe to drink? ▼
ARCO CITY OF (PWS ID: ID6120001) has 60 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,080 people using Groundwater sources.
How many people does ARCO CITY OF serve? ▼
ARCO CITY OF serves 1,080 people in ARCO, Idaho. It is a Local-owned system using Groundwater water sources with 619 service connections.
What type of violations does ARCO CITY OF have? ▼
ARCO CITY OF has 60 total violations: 13 health-based violations (MCL exceedances or treatment failures), 45 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in ARCO CITY OF water? ▼
No PFAS testing data is available for ARCO CITY OF under the EPA's UCMR5 monitoring program.
What water source does ARCO CITY OF use? ▼
ARCO CITY OF 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.

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by Kiznis Studio Editorial