PlainWater
Counties → South Dakota

Grant County, South Dakota

Water Systems
5
Population Served
9,119
Total Violations
827
18 health-based
PFAS Detected
1
of 1 tested

Violation Analysis

100.0%
Systems with Violations
165.4
Avg Violations per System
2.2%
Health-Based Violations

Water Source Types

GW
5 systems (100%)

PFAS Contamination

1
Systems Tested
1
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

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

No violations on record (0) One or more violations (5)

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
Grant-Roberts Rural Water System 5,050 10 Clean
Milbank 3,544 6 -
Big Stone City 412 126 -
Sunrise Colony 94 1 -
Marvin 19 684 -

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 Grant County? ▼
Grant County has 827 total drinking water violations across 5 water systems, of which 18 are health-based violations. 100.0% of systems have at least one violation.
How many people get water from Grant County systems? ▼
Water systems in Grant County serve approximately 9,119 people through 5 public water systems.
Has PFAS been detected in Grant County water? ▼
Of 1 water systems tested for PFAS in Grant County, 1 had PFAS detected (100.0% detection rate).
What types of water sources supply Grant County? ▼
Water systems in Grant County use GW (5 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. 2.2% of Grant 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.