What is Atrazine in drinking water?

Atrazine has 52,999 recorded EPA SDWIS violations across 9,462 public water systems (upper-third volume (> 49,133 violations)).

How many water systems have Atrazine violations?

9,462 systems, a wide national footprint (wide footprint (> 8,691 systems)).

Are Atrazine violations dangerous?

2.3% are health-based. The rest are monitoring/reporting, still compliance failures, but not the same as an MCL exceedance.

Where does Atrazine sit in the national contaminant ledger?

#43 of 157 indexable contaminants by violation volume - upper-third volume (> 49,133 violations), mid load (≤ 5.8 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 High-volume analyte

Atrazine in Drinking Water

Compiled by PlainWater · May 15, 2026

9,462 public water systems carry at least one Atrazine violation - wide footprint (> 8,691 systems).

Browse all SDWIS contaminants →

EPA contaminant code: 2050

Total Violations

52,999

Systems Affected

9,462

Health-Based %

2.3%

Violations / System

5.6

Atrazine standing, high-volume SDWIS third

Atrazine sits in the upper third of this extract by raw violation count (52,999), 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 sits mid-pack at 5.6 violations per affected system (mid load (≤ 5.8 violations per affected system)). Health-based share is only 2.3% - almost all of this analyte's trail is monitoring/reporting rather than MCL exceedance. Among 157 indexable contaminants, this page is #43 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

Selenium (52,594) Nitrate-Nitrite (52,447) Barium (50,993) BHC-GAMMA (50,797)

Nearest by systems affected

Toxaphene (9,474 systems) 2,4-D (9,509 systems) 2,4,5-TP (9,528 systems) Endrin (9,348 systems)

Atrazine: mixed health vs monitoring split

2.3% health-based · 97.7% monitoring/reporting across 52,999 records.

Health-based (2.3%) Monitoring/Reporting (97.7%)

Most Affected Water Systems

System	State	Violations	Population
Pinnacle Water Association	WV	188	85
Salem Heights Estate	PA	160	62
Congregation Ohr Menachem	PA	149	30
Coal Mountain Water	WV	149	80
Lewis Co Water Dist #2	WA	126	1,983
Skyview Estates	IL	124	56
Prague	OK	117	2,395
Marble Water System	WA	105	94
Warminster Municipal Authority	PA	103	40,000
Frankfort Psd	WV	100	6,747
Dabob Cove Community	WA	94	24
27 Maple Drive	CT	88	38
PA American Audubon	PA	88	8,200
Aqua PA Sun Valley	PA	79	120
Ft Madison Muni Water Works	IA	78	11,087
Vista del Rio Mobile Home Park	WA	75	352
Neshaminy Manor Center	PA	74	2,100
Springhill Park Subdivision	MT	72	90
Christ Mission Lutheran Church	IL	70	150
Nwwa Warrington Township	PA	68	21,588
Hettick	IL	67	174
Helena RV and Mobile Home Park	MT	66	250
Turkey Pen MHP	NC	66	229
Save a Pet	IL	64	50
Oilton	OK	64	1,435
Seneca Trail Christian Academy	WV	64	100
Malta City Of	MT	63	1,800
Newport Boro Water Auth	PA	63	3,200
Congregation Beth Judea	IL	62	25
Ambler Boro Water Dept	PA	60	20,000

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.