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EPA SDWIS High-volume analyte Majority health-based Dense per-system load

Groundwater Rule in Drinking Water

53.1% of 103,689 recorded violations are health-based - 7,907 systems in the EPA SDWIS extract.

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EPA contaminant code: 0700

Total Violations
103,689
Systems Affected
7,907
Health-Based %
53.1%
Violations / System
13.1

Groundwater Rule standing, high-volume SDWIS third

Groundwater Rule sits in the upper third of this extract by raw violation count (103,689), so the national record is thick enough that system-level lists below are a sample of a much larger compliance trail rather than a near-complete inventory. Load is concentrated: 13.1 violations per affected system (dense load (> 5.8 violations per affected system)), which usually means repeat findings on the same PWSIDs rather than one-off detections spread thin. Health-based share is 53.1% - most of this analyte's ledger is MCL or treatment-technique exceedance, not paperwork. Among 157 indexable contaminants, this page is #17 by violation volume. Utilities listed below are ranked by cumulative violation count for this analyte; pair that with population served to gauge household exposure scale.

Nationwide similar contaminants

Nearest by violation volume

E. COLI (103,381) Radium-226 (108,989) Benzene (96,774) Trichloroethylene (96,239)

Nearest by systems affected

Benzo(a)pyrene (7,904 systems) HEXACHLOROBENZENE (7,902 systems) Dinoseb (7,960 systems) Di(2-ethylhexyl) adipate (7,981 systems)

Groundwater Rule: mostly health-based findings

53.1% health-based · 46.9% monitoring/reporting across 103,689 records.

Health-based (53.1%) Monitoring/Reporting (46.9%)

Most Affected Water Systems

System State Violations Population
Hiawatha Water WV 518 63
Coal Mountain Water WV 500 80
Pinnacle Water Association WV 399 85
Stanton Hills Community PA 332 100
Milford Colony Inc MT 271 67
Burch Farms Country Market PA 264 25
Penns Creek Municipal Auth PA 263 725
Aqua PA Sun Valley PA 251 120
Paw Winola PA 251 130
Sunset MHP MO 244 80
Hoving Business Center MT 238 170
Green Frog, LLC. WV 230 60
Salem Heights Estate PA 224 62
Camino Real Regional Utility Authority NM 223 19,466
Green Camp Psd WV 217 44
G&t Country View Restaurant PA 210 25
Little Guys Baseball Club MO 207 150
Partners Produce ID 206 50
Bass Lake Park WV 194 40
Olympic Village PA 190 98
Bemis Campground WV 188 150
Stately Mansion Mobile Villa MO 181 100
Jonesboro Water System LA 177 6,231
Mountaineer Mini Mart WV 175 25
River Rest Campground WV 175 25
Phillips 66 #258 MO 173 300
Red Rock Water LLC ID 171 60
Midway Bowl Berkeley Springs WV 170 25
Stuarts Smokehouse WV 165 25
Gallatin Riverhouse Grill MT 158 50

Context: understanding water quality data · is my water safe?

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the EPA Safe Drinking Water Information System (SDWIS). Consult a qualified professional before making decisions based on this data.

Read our methodology - how this data is sourced, computed, and verified.

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.