PlainWater
Counties → South Dakota

Clay County, South Dakota

Water Systems
4
Population Served
17,173
Total Violations
71
9 health-based
PFAS Detected
2
of 2 tested

Violation Analysis

100.0%
Systems with Violations
17.8
Avg Violations per System
12.7%
Health-Based Violations

Water Source Types

GW
3 systems (75%)
SW
1 system (25%)

PFAS Contamination

2
Systems Tested
2
PFAS Detected
100.0%
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

Clay South Dakota water systems by violation status, EPA SDWIS records.

No violations on record (0) One or more violations (4)

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
Vermillion 11,695 3 Clean
Clay Rural Water System 4,780 12 Clean
Irene 422 38 -
Wakonda 276 18 -

Other Counties in South Dakota

Minnehaha County
15 systems · 254,737 served · 868 violations
Pennington County
157 systems · 140,305 served · 11,864 violations
Brookings County
12 systems · 41,264 served · 2,574 violations
Brown County
21 systems · 38,081 served · 1,750 violations
Lincoln County
8 systems · 35,801 served · 350 violations
Hughes County
6 systems · 27,114 served · 317 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Clay County? ▼
Clay County has 71 total drinking water violations across 4 water systems, of which 9 are health-based violations. 100.0% of systems have at least one violation.
How many people get water from Clay County systems? ▼
Water systems in Clay County serve approximately 17,173 people through 4 public water systems.
Has PFAS been detected in Clay County water? ▼
Of 2 water systems tested for PFAS in Clay County, 2 had PFAS detected (100.0% detection rate).
What types of water sources supply Clay County? ▼
Water systems in Clay County use GW (3 systems), SW (1 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. 12.7% of Clay 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.