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Contaminant guide

Diquat in drinking water

The EPA limit for Diquat in drinking water is 20 µg/L. Of the 14,283 water suppliers tested, 96 had it detected.

20 µg/L
EPA limit (MCL)
0.7%
of suppliers detected it
(96/14,283)

What the EPA limit means

⚖️

20 µg/L

Maximum Contaminant Level — the enforceable ceiling a supplier must stay under.

🎯

20 µg/L

Health goal (MCLG) — the level with no known health effect. It is a goal, not a legal limit, and is often zero for carcinogens.

🧪

SYR4

Where these measurements come from. Hover the tag for the EPA programme and years.

Where Diquat was found

The water suppliers reporting the highest levels, worst first. For lead and copper that is the 90th-percentile result the action level is written against; for Six-Year Review data, the 95th percentile of each system's samples.

SupplierCityStateLevel vs EPA limit
Redwood Terrace Mutual La Honda CA
18 µg/L 90%
of the EPA limit 20 µg/L
Lycoming Creek Village — PA
16.2 µg/L 81%
of the EPA limit 20 µg/L
Asoleado Mwc Carmel Valley CA
14 µg/L 70%
of the EPA limit 20 µg/L
Canada Woods Wc Carmel CA
8.7 µg/L 43%
of the EPA limit 20 µg/L
Florida Governmental Utility Authority Lehigh Acres FL
7.6 µg/L 38%
of the EPA limit 20 µg/L
Seminole - Big Cypress Hollywood FL
7.6 µg/L 38%
of the EPA limit 20 µg/L
Central Winter Haven FL
7.6 µg/L 38%
of the EPA limit 20 µg/L
Frostproof, City of Frostproof FL
7.6 µg/L 38%
of the EPA limit 20 µg/L
Seminole Utilities Immokalee Hollywood FL
7.6 µg/L 38%
of the EPA limit 20 µg/L
Seminole Utilities Hollywood Hollywood FL
7.2385 µg/L 36%
of the EPA limit 20 µg/L
Seminole - Brighton Reservation Hollywood FL
7.2343 µg/L 36%
of the EPA limit 20 µg/L
Lodi, City of Lodi CA
5.62 µg/L 28%
of the EPA limit 20 µg/L
Hialeah, City of Hialeah FL
5.2 µg/L 26%
of the EPA limit 20 µg/L
Yosemite Spring Park Util Co Coarsegold CA
5 µg/L 25%
of the EPA limit 20 µg/L
City of Austin Water & Wastewater Austin TX
4.03 µg/L 20%
of the EPA limit 20 µg/L
Milford Water Utilities Dept Milford NH
3.7 µg/L 19%
of the EPA limit 20 µg/L
Ruskin Mobile Home Park Ruskin FL
3.4 µg/L 17%
of the EPA limit 20 µg/L
Joseph Harp Corr Inst Lexington OK
3.12 µg/L 16%
of the EPA limit 20 µg/L
Us Army Garrison-Redstone Arsenal Redstone Arsenal AL
2.895 µg/L 14%
of the EPA limit 20 µg/L
Lower Lake County Water District Lower Lake CA
2.8 µg/L 14%
of the EPA limit 20 µg/L
City of Rainier Rainier OR
2.6 µg/L 13%
of the EPA limit 20 µg/L
Lake Tippecanoe Sarasota FL
2.5 µg/L 13%
of the EPA limit 20 µg/L
City of Mountain View Mountain View CA
2.4 µg/L 12%
of the EPA limit 20 µg/L
Ely Municipal Water Department Ely NV
2.3 µg/L 12%
of the EPA limit 20 µg/L
Hot Springs Village Waterworks Hot Springs Village AR
2.3 µg/L 12%
of the EPA limit 20 µg/L

Frequently asked questions about Diquat

What is Diquat in drinking water?

Diquat is monitored in US public drinking water under EPA rules. Each supplier's result is reported to the EPA and published here with its source and period.

What is the EPA limit for Diquat?

The EPA's Maximum Contaminant Level for Diquat is 20 µg/L, and its health goal (MCLG) is 20 µg/L. A result above the limit means the supplier must act; the goal is the level at which no health effects are expected.

How common is Diquat in US tap water?

Of the 14,283 water suppliers with results on file, 96 detected Diquat — 0.7% of those tested.