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EPA SDWIS High-volume analyte Dense per-system load

Vinyl chloride in Drinking Water

6.2 violations per affected system (76,766 across 12,475) - dense load (> 5.8 violations per affected system).

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EPA contaminant code: 2976

Total Violations
76,766
Systems Affected
12,475
Health-Based %
0.3%
Violations / System
6.2

Vinyl chloride standing, high-volume SDWIS third

Vinyl chloride sits in the upper third of this extract by raw violation count (76,766), 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: 6.2 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 only 0.3% - almost all of this analyte's trail is monitoring/reporting rather than MCL exceedance. Among 157 indexable contaminants, this page is #40 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

Fluoride (78,347) Xylenes, Total (79,013) Nitrite (72,418) Interim Enhanced Surface Water Treatment Rule (72,147)

Nearest by systems affected

Chromium (13,419 systems) Barium (13,488 systems) Mercury (13,488 systems) Cadmium (13,518 systems)

Vinyl chloride: mixed health vs monitoring split

0.3% health-based · 99.7% monitoring/reporting across 76,766 records.

Health-based (0.3%) Monitoring/Reporting (99.7%)

Most Affected Water Systems

System State Violations Population
Lake Forest Park Water District WA 475 3,171
Timber Creek MHP East & West OK 362 40
Satsop Business Park WA 266 544
Seven Estates TX 264 189
Eastside MHP OK 224 32
Pinnacle Water Association WV 203 85
Carmel Montessori Academy IL 181 40
Okarche RWD, Inc OK 163 250
Kelley Crest WA 147 45
Coal Mountain Water WV 146 80
Franklin Water Systems 3 TX 113 201
Tel Company 3 WA 107 75
Walnut Cove, Town Of NC 102 2,210
Marble Water System WA 102 94
Tempo Lake Water Co WA 102 246
Imagination Station Academy, LLC NC 101 35
Dabob Cove Community WA 94 24
Willow Springs MHP IN 90 25
Roche Harbor Water System Inc WA 87 1,985
27 Maple Drive CT 85 38
Kuzmanich Water System WA 85 45
Sapphire Lakes Development NC 84 724
Quaker Creek Store NY 84 100
Lewis River Golf Course WA 84 300
American Precision Elctronics IL 81 60
Woodland Park Mobil Court WA 80 75
Sonrise Church OH 78 50
Forest River - Rance Aluminum, Div. 46 IN 77 40
Turkey Pen MHP NC 77 229
Lee Limas Mobile Home Park TX 77 39

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.