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Community Water System · PWS IA2742076

Leon Water Supply

Leon, Iowa 50144 - drinking water served from surface water sources to 1,830 people, tracked in EPA SDWIS and UCMR5.

1,830
People served
122
EPA violations
52
Health-based
Untested
UCMR5 result

The verdict

EPA records 122 drinking-water violations at Leon Water Supply, 43% of them health-based - above the Iowa per-system average.

122
Total EPA violations on record
43%
Health-based (MCL / treatment failure)
1,830
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Leon Water Supply

Leon Water Supply is a local-owned community water system that delivers drinking water to 1,830 residents in Leon, Iowa (Decatur County) through 825 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 122 total violations for this system , of which 52 (43%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 27 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Combined Radium (-226 and -228), recorded in 20 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 Iowa, EPA tracks 1,795 public water systems serving 3,114,444 people, with 138,271 cumulative violations and 27,946 health-based violations on record. About 95% of systems in the state carry at least one violation, and state-wide the average per system is 77 violations. Statewide, 127 of 152 UCMR5-tested systems have reported PFAS detections (83.6%).

Leon Water Supply's 122 violations sit above the Iowa 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
1,830
Total Violations
122
Health-Based Violations
52
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
825
County
Decatur
School/Daycare
No
MCL Violations
43
Monitoring Violations
27
Treatment Tech Violations
9

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Combined Radium (-226 and -228) MCL 20 1985
Total Haloacetic Acids (HAA5) MCL 9 2016
Surface Water Treatment Rule TT 9 2023
TTHM MCL 8 2016
TTHM MR 6 2022
Total Haloacetic Acids (HAA5) MR 6 2022
Fluoride MCL 5 1984
Nitrate MR 4 1989
Atrazine MR 4 1995
CARBON, TOTAL MR 4 2018
Gross Alpha, Excl. Radon and U MR 3 1985
Gross Alpha, Excl. Radon and U MCL 1 1983

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 Leon Water Supply.

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 IA2742076 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Iowa Drinking Water Authority

Iowa'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 IA 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
2023 Surface Water Treatment Rule TT 9 SDWIS / IA2742076 / 0200
2022 TTHM MR 6 SDWIS / IA2742076 / 2950
2022 Total Haloacetic Acids (HAA5) MR 6 SDWIS / IA2742076 / 2456
2018 CARBON, TOTAL MR 4 SDWIS / IA2742076 / 2920
2016 Total Haloacetic Acids (HAA5) MCL 9 SDWIS / IA2742076 / 2456
2016 TTHM MCL 8 SDWIS / IA2742076 / 2950
1995 Atrazine MR 4 SDWIS / IA2742076 / 2050
1989 Nitrate MR 4 SDWIS / IA2742076 / 1040
1985 Combined Radium (-226 and -228) MCL 20 SDWIS / IA2742076 / 4010
1985 Gross Alpha, Excl. Radon and U MR 3 SDWIS / IA2742076 / 4000
1984 Fluoride MCL 5 SDWIS / IA2742076 / 1025
1983 Gross Alpha, Excl. Radon and U MCL 1 SDWIS / IA2742076 / 4000

How Leon Water Supply Compares

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

Metric Leon Water Supply Iowa avg Federal benchmark
Total violations 122 77 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 52 15.6 Indicates a contaminant exceeded a federal MCL
PFAS detection None 83.6% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,830 1,735 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,795 regulated public water systems in Iowa.

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 Leon Water Supply water safe to drink? ▼
Leon Water Supply (PWS ID: IA2742076) has 122 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,830 people using Surface Water sources.
How many people does Leon Water Supply serve? ▼
Leon Water Supply serves 1,830 people in Leon, Iowa. It is a Local-owned system using Surface Water water sources with 825 service connections.
What type of violations does Leon Water Supply have? ▼
Leon Water Supply has 122 total violations: 52 health-based violations (MCL exceedances or treatment failures), 27 monitoring/reporting violations, and 9 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Leon Water Supply water? ▼
No PFAS testing data is available for Leon Water Supply under the EPA's UCMR5 monitoring program.
What water source does Leon Water Supply use? ▼
Leon Water Supply 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.
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.