PlainWater
Counties → Iowa

Mahaska County, Iowa

Water Systems
4
Population Served
24,159
Total Violations
390
41 health-based
PFAS Detected
1
of 2 tested

Violation Analysis

75.0%
Systems with Violations
97.5
Avg Violations per System
10.5%
Health-Based Violations

Water Source Types

SW
2 systems (50%)
GW
2 systems (50%)

PFAS Contamination

2
Systems Tested
1
PFAS Detected
50.0%
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

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

No violations on record (1) One or more violations (3)

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
Oskaloosa Municipal Water Dept 12,808 251 Clean
Mahaska Rural Water System, Inc. 9,818 27 Clean
Mahaska Rural Water (New Sharon) 1,368 112 -
Oak Creek MHP 165 0 -

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 Mahaska County? ▼
Mahaska County has 390 total drinking water violations across 4 water systems, of which 41 are health-based violations. 75.0% of systems have at least one violation.
How many people get water from Mahaska County systems? ▼
Water systems in Mahaska County serve approximately 24,159 people through 4 public water systems.
Has PFAS been detected in Mahaska County water? ▼
Of 2 water systems tested for PFAS in Mahaska County, 1 had PFAS detected (50.0% detection rate).
What types of water sources supply Mahaska County? ▼
Water systems in Mahaska County use SW (2 systems), GW (2 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. 10.5% of Mahaska 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.