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Contaminant guide

Chlorite in drinking water

The EPA limit for Chlorite in drinking water is 1000 µg/L. Of the 456 water suppliers tested, 356 had it detected.

1000 µg/L
EPA limit (MCL)
78.1%
of suppliers detected it
(356/456)

What Chlorite is, and why it's regulated

Chlorite is a by-product of chlorine dioxide disinfection; high levels can cause anaemia and affect infants' nervous systems.

What the EPA limit means

⚖️

1000 µg/L

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

🎯

800 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 Chlorite 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
Public Wholesale Wsd 19 Columbus KS
1480 µg/L 148%
of the EPA limit, at the 95th percentile of samples — 1000 µg/L
Maverick County Airport Water Works Eagle Pass TX
1430 µg/L 143%
of the EPA limit, at the 95th percentile of samples — 1000 µg/L
Eastland County Water Supply District Ranger TX
1278.5 µg/L 128%
of the EPA limit, at the 95th percentile of samples — 1000 µg/L
Rifle City of Rifle CO
1120 µg/L 112%
of the EPA limit, at the 95th percentile of samples — 1000 µg/L
Frederick Frederick OK
1066.5 µg/L 107%
of the EPA limit, at the 95th percentile of samples — 1000 µg/L
Claremore Claremore OK
1041 µg/L 104%
of the EPA limit, at the 95th percentile of samples — 1000 µg/L
Altus Altus OK
996.75 µg/L 100%
of the EPA limit 1000 µg/L
Creek Co Rwd # 7 Mounds OK
993.9 µg/L 99%
of the EPA limit 1000 µg/L
Okla Ordnance Works Authority Pryor OK
969.9 µg/L 97%
of the EPA limit 1000 µg/L
Ibwc Falcon Village — TX
967.25 µg/L 97%
of the EPA limit 1000 µg/L
Ej Water Cooperative — IL
960 µg/L 96%
of the EPA limit 1000 µg/L
City of Mineral Wells Mineral Wells TX
960 µg/L 96%
of the EPA limit 1000 µg/L
Brunswick County Water System Leland NC
958 µg/L 96%
of the EPA limit 1000 µg/L
Montgomery Co Regional Pwa Mount Ida AR
956.9 µg/L 96%
of the EPA limit 1000 µg/L
Vienna Correctional Center Vienna IL
954 µg/L 95%
of the EPA limit 1000 µg/L
Shawnee Municipal Authority Shawnee OK
953.5 µg/L 95%
of the EPA limit 1000 µg/L
Walnut Creek Sud Springtown TX
945 µg/L 95%
of the EPA limit 1000 µg/L
Fort Bend County Wcid 2 Stafford TX
943 µg/L 94%
of the EPA limit 1000 µg/L
Jbsa Sam Houston San Antonio TX
939 µg/L 94%
of the EPA limit 1000 µg/L
San Patricio Mwd Ingleside TX
938 µg/L 94%
of the EPA limit 1000 µg/L
Vienna Vienna IL
937 µg/L 94%
of the EPA limit 1000 µg/L
Opelika, Ww Bd. of the City of Opelika AL
930 µg/L 93%
of the EPA limit 1000 µg/L
Humboldt, City of Humboldt KS
926.5 µg/L 93%
of the EPA limit 1000 µg/L
Warrior River Water Authority Bessemer AL
926.35 µg/L 93%
of the EPA limit 1000 µg/L
Hamilton Water & Wastewater Department Hamilton AL
924.05 µg/L 92%
of the EPA limit 1000 µg/L

Frequently asked questions about Chlorite

What is Chlorite in drinking water?

Chlorite is a by-product of chlorine dioxide disinfection; high levels can cause anaemia and affect infants' nervous systems.

What is the EPA limit for Chlorite?

The EPA's Maximum Contaminant Level for Chlorite is 1000 µg/L, and its health goal (MCLG) is 800 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 Chlorite in US tap water?

Of the 456 water suppliers with results on file, 356 detected Chlorite — 78.1% of those tested.