What is Diquat in drinking water?

Diquat averages 5.2 violations per affected system (29,815 total / 5,771 systems) in the EPA SDWIS extract.

How many water systems have Diquat violations?

5,771 systems sit in the mid footprint band (mid footprint (≤ 8,691 systems)).

Are Diquat violations dangerous?

In this extract, 0% are health-based. Recorded findings are monitoring/reporting class, not MCL exceedances.

Where does Diquat sit in the national contaminant ledger?

#80 of 157 indexable contaminants by violation volume - middle-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

Diquat in Drinking Water

Compiled by PlainWater · May 15, 2026

5.2 violations per affected system (29,815 across 5,771) - mid load (≤ 5.8 violations per affected system).

Browse all SDWIS contaminants →

EPA contaminant code: 2032

Total Violations

29,815

Systems Affected

5,771

Health-Based %

Violations / System

5.2

Diquat standing, mid-volume SDWIS third

Diquat lands in the middle third by violation volume (29,815), 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 5.2 violations per affected system (mid load (≤ 5.8 violations per affected system)). None of the recorded Diquat violations in this extract are classified health-based; the trail is procedural. Among 157 indexable contaminants, this page is #80 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

Nickel (29,603) CYANIDE (28,582) LEAD AND COPPER RULE REVISIONS (32,859) Endothall (26,423)

Nearest by systems affected

Nitrate-Nitrite (5,756 systems) Surface Water Treatment Rule (6,127 systems) Combined Radium (-226 and -228) (6,396 systems) Glyphosate (5,017 systems)

Diquat: monitoring/reporting trail

0% health-based · 100.0% monitoring/reporting across 29,815 records.

Health-based (0%) Monitoring/Reporting (100.0%)

Most Affected Water Systems

System	State	Violations	Population
Salem Heights Estate	PA	157	62
Congregation Ohr Menachem	PA	149	30
Skyview Estates	IL	124	56
Prague	OK	111	2,395
27 Maple Drive	CT	88	38
Aqua PA Sun Valley	PA	79	120
Neshaminy Manor Center	PA	74	2,100
Oilton	OK	64	1,435
Ambler Boro Water Dept	PA	60	20,000
Paradise Stream Resor	PA	60	774
Criswell Court MHP	IL	59	94
Willow Springs MHP	IN	56	25
Payson Town Of	AZ	55	17,682
Plymouth Community Church	IN	53	90
Indian Creek Valley Water Auth	PA	53	7,000
Pbc Linear	IL	52	140
Tower Springs LLC	PA	50	25
Boley Tool and Machine Works	IL	49	100
Southbrook Estates	SD	49	28
Santiam Meadows Community WS	OR	46	40
Creekside South Estates Metro District	CO	45	160
Virgin Valley Water District	NV	45	26,000
Bridge Creek School	OK	45	800
Roamingwood Sewer and Water	PA	45	3,775
Bermuda Water Company Inc	AZ	44	25,000
Joseph Harp Corr Inst	OK	44	3,000
Rock Creek	OK	44	33
PA American Audubon	PA	44	8,200
Happy Camper RV Park	CO	43	40
Save a Pet	IL	43	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.