What is Chromium in drinking water?

Chromium averages 3.7 violations per affected system (49,133 total / 13,419 systems) in the EPA SDWIS extract.

How many water systems have Chromium violations?

13,419 systems, a wide national footprint (wide footprint (> 8,691 systems)).

Are Chromium violations dangerous?

0.3% are health-based. The rest are monitoring/reporting, still compliance failures, but not the same as an MCL exceedance.

Where does Chromium sit in the national contaminant ledger?

#53 of 157 indexable contaminants by violation volume - middle-third volume (≤ 49,133 violations), sparse load (≤ 3.7 violations per affected system).

Where does this contaminant data come from?

EPA Safe Drinking Water Information System (SDWIS) quarterly extracts. Counts are cumulative compliance records, not a live risk score for a single tap.

Contaminants →

EPA SDWIS

Chromium in Drinking Water

Compiled by PlainWater · May 15, 2026

3.7 violations per affected system (49,133 across 13,419) - sparse load (≤ 3.7 violations per affected system).

Browse all SDWIS contaminants →

EPA contaminant code: 1020

Total Violations

49,133

Middle third of contaminants

Systems Affected

13,419

Wider third of contaminants

Health-Based %

0.3%

Upper third of contaminants

Violations / System

3.7

Lower third of contaminants

Chromium standing, mid-volume SDWIS third

Chromium lands in the middle third by violation volume (49,133), large enough for peer comparisons but not one of the handful of analytes that dominate the fleet-wide SDWIS ledger. Load is sparse: 3.7 violations per affected system (sparse load (≤ 3.7 violations per affected system)), so the footprint is wide relative to the raw count, many systems with few records each. 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 #53 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

LASSO (49,306) 2,4-D (49,369) Simazine (48,645) Mercury (49,728)

Nearest by systems affected

Fluoride (13,411 systems) Barium (13,488 systems) Cadmium (13,518 systems) Selenium (13,645 systems)

Chromium: mixed health vs monitoring split

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

Most Affected Water Systems

System	State	Violations	Population
Ridgefield Public Works	WA	114	20,967
PA American Audubon	PA	77	8,200
Seven Estates	TX	67	189
Coal Mountain Water	WV	56	80
Mount Eagle Water Assoc	PA	55	130
Franklin Water Systems 3	TX	55	201
Hiawatha Water	WV	51	63
Washington Township Mua	NJ	49	48,000
Nottingham Manor M H Court	PA	49	473
Shrewsbury Borough	PA	48	4,727
Akhiok	AK	43	90
Culvers Hill - North Webster	IN	40	75
Westwood MHP	NC	40	56
Shiloh S/D	NC	39	67
Whispering Pines MHP	NC	39	305
Pinnacle Water Association	WV	39	85
Toxaway Point	NC	38	79
Tucson City Of	AZ	37	732,906
Happy Camper RV Park	CO	37	40
South Bend Water Department	WA	37	2,930
Creekside South Estates Metro District	CO	36	160
Burlington City Of	CO	36	3,720
Windmill Estates	IL	36	65
Carmel Montessori Academy	IL	36	40
Circle H MHP	NC	35	68
Deerfield Park S/D	NC	35	440
East Cherry Creek Valley WSD	CO	34	66,130
Paint Brush Hills	CO	34	4,994
Franklin Water Systems 3	TX	34	201
Willow Springs MHP	IN	33	25

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. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.