PlainWater
States → Idaho

Community Water System · PWS ID7100041

Iona Water Dept

Iona, Idaho 83427 - drinking water served from groundwater sources to 2,717 people, tracked in EPA SDWIS and UCMR5.

2,717
People served
33
EPA violations
15
Health-based
Untested
UCMR5 result

The verdict

EPA records 33 drinking-water violations at Iona Water Dept, 45% of them health-based - below the Idaho per-system average.

33
Total EPA violations on record
45%
Health-based (MCL / treatment failure)
2,717
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Iona Water Dept

Iona Water Dept is a local-owned community water system that delivers drinking water to 2,717 residents in Iona, Idaho (Bonneville County) through 1,000 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 33 total violations for this system , of which 15 (45%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 16 monitoring and reporting violations are on file. The most recent violation on record dates to 2015.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 15 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%).

Iona Water Dept's 33 violations sit below 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
2,717
Total Violations
33
Health-Based Violations
15
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
1,000
County
Bonneville
School/Daycare
No
MCL Violations
15
Monitoring Violations
16
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 15 2015
Coliform (TCR) MR 6 2003
Nitrate MR 4 2002
Dinoseb MR 1 2005
Pentachlorophenol MR 1 2005
Picloram MR 1 2005
2,4,5-TP MR 1 2005
Dalapon MR 1 2005
2,4-D MR 1 2005

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 Iona Water Dept.

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 ID7100041 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
2015 Coliform (TCR) MCL 15 SDWIS / ID7100041 / 3100
2005 Dinoseb MR 1 SDWIS / ID7100041 / 2041
2005 Pentachlorophenol MR 1 SDWIS / ID7100041 / 2326
2005 Picloram MR 1 SDWIS / ID7100041 / 2040
2005 2,4,5-TP MR 1 SDWIS / ID7100041 / 2110
2005 Dalapon MR 1 SDWIS / ID7100041 / 2031
2005 2,4-D MR 1 SDWIS / ID7100041 / 2105
2003 Coliform (TCR) MR 6 SDWIS / ID7100041 / 3100
2002 Nitrate MR 4 SDWIS / ID7100041 / 1040

How Iona Water Dept Compares

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

Metric Iona Water Dept Idaho avg Federal benchmark
Total violations 33 52.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 15 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 2,717 870 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 Iona Water Dept water safe to drink? ▼
Iona Water Dept (PWS ID: ID7100041) has 33 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,717 people using Groundwater sources.
How many people does Iona Water Dept serve? ▼
Iona Water Dept serves 2,717 people in Iona, Idaho. It is a Local-owned system using Groundwater water sources with 1,000 service connections.
What type of violations does Iona Water Dept have? ▼
Iona Water Dept has 33 total violations: 15 health-based violations (MCL exceedances or treatment failures), 16 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Iona Water Dept water? ▼
No PFAS testing data is available for Iona Water Dept under the EPA's UCMR5 monitoring program.
What water source does Iona Water Dept use? ▼
Iona Water Dept 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.