PlainWater
Counties → Iowa

Decatur County, Iowa

Water Systems
6
Population Served
59,279
Total Violations
574
108 health-based
PFAS Detected
1
of 3 tested

Violation Analysis

100.0%
Systems with Violations
95.7
Avg Violations per System
18.8%
Health-Based Violations

Water Source Types

SW
6 systems (100%)

PFAS Contamination

3
Systems Tested
1
PFAS Detected
33.3%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Decatur Iowa water systems by violation status, EPA SDWIS records.

No violations on record (0) One or more violations (6)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
Rathbun Regional Water Assn (Rathbun) 33,000 200 Clean
Sirwa #2 (Creston) 20,793 49 Clean
Lamoni Municipal Utilities 2,104 154 -
Leon Water Supply 1,830 122 -
Sirwa #3 (Leon) 1,373 21 -
Garden Grove Water Supply 179 28 Detected

Other Counties in Iowa

Polk County
38 systems · 552,627 served · 1,563 violations
Linn County
83 systems · 224,711 served · 8,540 violations
Scott County
77 systems · 178,285 served · 5,956 violations
Johnson County
125 systems · 167,742 served · 10,912 violations
Black Hawk County
19 systems · 161,225 served · 824 violations
Story County
21 systems · 121,108 served · 1,299 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Decatur County? ▼
Decatur County has 574 total drinking water violations across 6 water systems, of which 108 are health-based violations. 100.0% of systems have at least one violation.
How many people get water from Decatur County systems? ▼
Water systems in Decatur County serve approximately 59,279 people through 6 public water systems.
Has PFAS been detected in Decatur County water? ▼
Of 3 water systems tested for PFAS in Decatur County, 1 had PFAS detected (33.3% detection rate).
What types of water sources supply Decatur County? ▼
Water systems in Decatur County use SW (6 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 18.8% of Decatur County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

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 page draws directly on 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.