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EPA SDWIS Majority health-based

Lead in Drinking Water

96.9% of 324 recorded violations are health-based - 78 systems in the EPA SDWIS extract.

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EPA contaminant code: 1030

Total Violations
324
Systems Affected
78
Health-Based %
96.9%
Violations / System
4.2

Lead standing, mid-volume SDWIS third

Lead lands in the middle third by violation volume (324), large enough for peer comparisons but not one of the handful of analytes that dominate the fleet-wide SDWIS ledger. Load sits mid-pack at 4.2 violations per affected system (mid load (≤ 5.8 violations per affected system)). Health-based share is 96.9% - most of this analyte's ledger is MCL or treatment-technique exceedance, not paperwork. Among 157 indexable contaminants, this page is #102 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

Tritium (315) 38-STRONTIUM-90 (286) COPPER, FREE (253) ManMade Beta Particle and Photon Emitter (118)

Nearest by systems affected

1,1-Dichloroethane (34 systems) 1,1-Dichloropropene (34 systems) 1,1,1,2-Tetrachloroethane (34 systems) 1,1,2,2-Tetrachloroethane (34 systems)

Lead: mostly health-based findings

96.9% health-based · 3.1% monitoring/reporting across 324 records.

Health-based (96.9%) Monitoring/Reporting (3.1%)

Most Affected Water Systems

System State Violations Population
Green Mansions HOA Tennis & Swim NY 24 180
Whitehall Village NY 17 2,800
Bolton Water District NY 11 1,800
Metlakatla 10 9 1,575
Twin Oaks Housing NY 8 19
Wilmington WD NY 8 980
Saranac Lake V NY 8 5,345
Balsam Crest Homeowners Assoc NY 8 50
Northern Adirondack Cen. Sch. NY 8 1,154
Clinton Correctional Facility NY 7 4,900
Ausable Heights Water System NY 7 46
Schroon Lake WD NY 7 2,750
Pottersville Water District NY 7 300
Waterford Water Works (Purchase Troy) NY 7 9,800
Salmon River Central School NY 6 1,600
Charlestown Elementary School RI 5 350
Lewis WD NY 5 428
Quileute Water System 10 4 885
Simplot Potato ID 4 450
Northway Mobile Home Park - Plattsburgh NY 4 54
Vista Village MHP NY 4 43
Twin Ells Mobile Home Park NY 4 108
Adirondack Apartments NY 4 40
Lighthouse Apartments NY 4 28
Port Henry WD NY 4 1,831
Willsboro WD NY 4 1,571
Williston Park (V) NY 4 7,287
Wallkill/Shawangunk Correction NY 4 1,200
Lake George Village NY 4 1,800
Evergreen Homeowners Assoc. NY 4 100

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.