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Community Water System · PWS ID5420021

Filer Water Works

Filer, Idaho 83328 - drinking water served from groundwater sources to 2,858 people, tracked in EPA SDWIS and UCMR5.

2,858
People served
276
EPA violations
183
Health-based
Untested
UCMR5 result

The verdict

EPA records 276 drinking-water violations at Filer Water Works, 66% of them health-based - above the Idaho per-system average.

276
Total EPA violations on record
66%
Health-based (MCL / treatment failure)
2,858
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Filer Water Works

Filer Water Works is a local-owned community water system that delivers drinking water to 2,858 residents in Filer, Idaho (Twin Falls County) through 975 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 276 total violations for this system , of which 183 (66%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 66 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 Arsenic, recorded in 181 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%).

Filer Water Works's 276 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
2,858
Total Violations
276
Health-Based Violations
183
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
975
County
Twin Falls
School/Daycare
No
MCL Violations
183
Monitoring Violations
66
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Arsenic MCL 181 2021
Chlorine MR 18 2022
Coliform (TCR) MR 10 2012
Revised Total Coliform Rule MON 7 2021
Public Notice Other 5 2016
TTHM MR 4 2009
Arsenic MR 4 2010
LEAD AND COPPER RULE REVISIONS RPT 4 2025
Total Haloacetic Acids (HAA5) MR 4 2009
E. COLI MR 3 2023
Lead and Copper Rule MR 3 2025
Nitrate MR 2 1998
Consumer Confidence Rule Other 2 1999
Coliform (TCR) MCL 2 1996
Selenium MR 2 1993
Barium MR 1 1993
Chromium MR 1 1993
Mercury MR 1 1993
Antimony, Total MR 1 1993
Thallium, Total MR 1 1993
Nickel MR 1 1993
Fluoride MR 1 1993
Beryllium, Total MR 1 1993
Cadmium MR 1 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 Filer Water Works.

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 ID5420021 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 LEAD AND COPPER RULE REVISIONS RPT 4 SDWIS / ID5420021 / 5200
2025 Lead and Copper Rule MR 3 SDWIS / ID5420021 / 5000
2023 E. COLI MR 3 SDWIS / ID5420021 / 3014
2022 Chlorine MR 18 SDWIS / ID5420021 / 0999
2021 Arsenic MCL 181 SDWIS / ID5420021 / 1005
2021 Revised Total Coliform Rule MON 7 SDWIS / ID5420021 / 8000
2016 Public Notice Other 5 SDWIS / ID5420021 / 7500
2012 Coliform (TCR) MR 10 SDWIS / ID5420021 / 3100
2010 Arsenic MR 4 SDWIS / ID5420021 / 1005
2009 TTHM MR 4 SDWIS / ID5420021 / 2950
2009 Total Haloacetic Acids (HAA5) MR 4 SDWIS / ID5420021 / 2456
1999 Consumer Confidence Rule Other 2 SDWIS / ID5420021 / 7000
1998 Nitrate MR 2 SDWIS / ID5420021 / 1040
1996 Coliform (TCR) MCL 2 SDWIS / ID5420021 / 3100
1993 Selenium MR 2 SDWIS / ID5420021 / 1045

How Filer Water Works Compares

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

Metric Filer Water Works Idaho avg Federal benchmark
Total violations 276 52.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 183 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 2,858 870 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 Filer Water Works water safe to drink? ▼
Filer Water Works (PWS ID: ID5420021) has 276 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,858 people using Groundwater sources.
How many people does Filer Water Works serve? ▼
Filer Water Works serves 2,858 people in Filer, Idaho. It is a Local-owned system using Groundwater water sources with 975 service connections.
What type of violations does Filer Water Works have? ▼
Filer Water Works has 276 total violations: 183 health-based violations (MCL exceedances or treatment failures), 66 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Filer Water Works water? ▼
No PFAS testing data is available for Filer Water Works under the EPA's UCMR5 monitoring program.
What water source does Filer Water Works use? ▼
Filer Water Works 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.