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Community Water System · PWS ID7220004

Ashton City Of

Ashton, Idaho 83420 - drinking water served from groundwater sources to 1,129 people, tracked in EPA SDWIS and UCMR5.

1,129
People served
188
EPA violations
133
Health-based
Untested
UCMR5 result

The verdict

EPA records 188 drinking-water violations at Ashton City Of, 71% of them health-based - above the Idaho per-system average.

188
Total EPA violations on record
71%
Health-based (MCL / treatment failure)
1,129
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Ashton City Of

Ashton City Of is a local-owned community water system that delivers drinking water to 1,129 residents in Ashton, Idaho (Fremont County) through 516 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 188 total violations for this system , of which 133 (71%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 41 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 Nitrate, recorded in 127 violations (MCL, 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%).

Ashton City Of's 188 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
1,129
Total Violations
188
Health-Based Violations
133
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
516
County
Fremont
School/Daycare
No
MCL Violations
133
Monitoring Violations
41
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrate MCL 127 2012
Chlorine MR 11 2025
Public Notice Other 8 2013
Revised Total Coliform Rule MON 8 2020
TTHM MR 6 2024
Total Haloacetic Acids (HAA5) MR 6 2024
Coliform (TCR) MCL 6 2001
Coliform (TCR) MR 4 2002
2,4,5-TP MR 1 1996
Nitrate MR 1 1996
Dinoseb MR 1 1996
2,4-D MR 1 1996
Picloram MR 1 1996
Dalapon MR 1 1996

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 Ashton 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 ID7220004 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 Chlorine MR 11 SDWIS / ID7220004 / 0999
2024 TTHM MR 6 SDWIS / ID7220004 / 2950
2024 Total Haloacetic Acids (HAA5) MR 6 SDWIS / ID7220004 / 2456
2020 Revised Total Coliform Rule MON 8 SDWIS / ID7220004 / 8000
2013 Public Notice Other 8 SDWIS / ID7220004 / 7500
2012 Nitrate MCL 127 SDWIS / ID7220004 / 1040
2002 Coliform (TCR) MR 4 SDWIS / ID7220004 / 3100
2001 Coliform (TCR) MCL 6 SDWIS / ID7220004 / 3100
1996 2,4,5-TP MR 1 SDWIS / ID7220004 / 2110
1996 Nitrate MR 1 SDWIS / ID7220004 / 1040
1996 Dinoseb MR 1 SDWIS / ID7220004 / 2041
1996 2,4-D MR 1 SDWIS / ID7220004 / 2105
1996 Picloram MR 1 SDWIS / ID7220004 / 2040
1996 Dalapon MR 1 SDWIS / ID7220004 / 2031

How Ashton City Of Compares

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

Metric Ashton City Of Idaho avg Federal benchmark
Total violations 188 52.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 133 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 1,129 870 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 Ashton City Of water safe to drink? ▼
Ashton City Of (PWS ID: ID7220004) has 188 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,129 people using Groundwater sources.
How many people does Ashton City Of serve? ▼
Ashton City Of serves 1,129 people in Ashton, Idaho. It is a Local-owned system using Groundwater water sources with 516 service connections.
What type of violations does Ashton City Of have? ▼
Ashton City Of has 188 total violations: 133 health-based violations (MCL exceedances or treatment failures), 41 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Ashton City Of water? ▼
No PFAS testing data is available for Ashton City Of under the EPA's UCMR5 monitoring program.
What water source does Ashton City Of use? ▼
Ashton 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.
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.