Know Your Environment. Protect Your Health.

Chlorite

City of Stamford

Chlorite is a disinfection byproduct resulting from water treatment with chlorine dioxide. Chlorite decreases hemoglobin levels and causes other hematologic effects. Read More.

Chlorite also forms when chlorine dioxide is used as a bleaching agent for textiles, paper pulp, flour and oils, and from the use of chlorine dioxide in food and packaging.� In 2009, California published a public health goal of 50 parts per billion for chlorite in drinking water. California state scientists reported that chlorite causes red blood cell damage, affects sperm and thyroid function, and may alter behavior and neurodevelopment of rat pups exposed in the womb.

Click here to read more about disinfection byproducts.

 

168

Samples

0

Samples exceeding legal limit (MCL)

93

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018153.7 ppb3626ND - 861.0 ppb
2019135.1 ppb3629ND - 706.0 ppb
2020109.3 ppb3626ND - 353.0 ppb
202138.1 ppb248ND - 198.0 ppb
2022N/A00N/A
2023363.0 ppb3635ND - 864.0 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 50 ppb

The EWG Health Guideline of 50 ppb for chlorite was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against change in blood chemistry.

EPA Maximum Contaminant
Level (MCL): 1,000 ppb

ppb = parts per billion

All test results

Date Lab ID Result
2018-01-10165272384.3 ppb
2018-01-10165272423.0 ppb
2018-01-10165272585.2 ppb
2018-02-211663882585.0 ppb
2018-02-21166388699.8 ppb
2018-02-211663887584.0 ppb
2018-03-141669154861.0 ppb
2018-03-141669155304.0 ppb
2018-03-141669156461.0 ppb
2018-04-111676146318.0 ppb
2018-04-111676147186.0 ppb
2018-04-111676148490.0 ppb
2018-05-031682044218.0 ppb
2018-05-03168204597.2 ppb
2018-05-03168204671.4 ppb
2018-06-06169067349.0 ppb
2018-06-061690674ND
2018-06-06169067511.3 ppb
2018-07-051698388244.0 ppb
2018-07-051698389ND
2018-07-051698390ND
2018-08-01170563956.9 ppb
2018-08-011705641ND
2018-08-011705642ND
2018-09-12171698389.5 ppb
2018-09-12171698427.9 ppb
2018-09-121716985ND
2018-10-171727537106.0 ppb
2018-10-171727539ND
2018-10-17172754048.4 ppb
2018-11-071733393157.0 ppb
2018-11-071733394ND
2018-11-071733395ND
2018-12-121743053211.0 ppb
2018-12-121743054ND
2018-12-12174305563.0 ppb
2019-01-091749581706.0 ppb
2019-01-09174958271.9 ppb
2019-01-091749583237.0 ppb
2019-02-061757142ND
2019-02-06175714314.3 ppb
2019-02-061757144ND
2019-03-061764671123.0 ppb
2019-03-06176467227.9 ppb
2019-03-06176467396.7 ppb
2019-04-031772290158.0 ppb
2019-04-03177229737.7 ppb
2019-04-03177229840.4 ppb
2019-05-021780486314.0 ppb
2019-05-02178048794.2 ppb
2019-05-02178048843.6 ppb
2019-06-061789952208.0 ppb
2019-06-06178995328.4 ppb
2019-06-06178995422.9 ppb
2019-07-251804726497.0 ppb
2019-07-25180472726.9 ppb
2019-07-251804728ND
2019-08-011806418383.0 ppb
2019-08-01180641916.2 ppb
2019-08-011806420ND
2019-09-051816847332.0 ppb
2019-09-051816848ND
2019-09-05181684911.7 ppb
2019-10-031826195556.0 ppb
2019-10-03182619671.4 ppb
2019-10-031826197103.0 ppb
2019-11-071836372244.0 ppb
2019-11-071836373ND
2019-11-071836374ND
2019-12-051844497338.0 ppb
2019-12-05184449816.3 ppb
2019-12-05184449943.9 ppb
2020-01-091853449317.0 ppb
2020-01-09185345055.4 ppb
2020-01-091853451122.0 ppb
2020-02-101861807ND
2020-02-101861809260.0 ppb
2020-02-101861810167.0 ppb
2020-03-051869101270.0 ppb
2020-03-05186910227.5 ppb
2020-03-051869103226.0 ppb
2020-04-021876666115.0 ppb
2020-04-02187666731.7 ppb
2020-04-02187666851.1 ppb
2020-05-071886130290.0 ppb
2020-05-071886131ND
2020-05-071886132115.0 ppb
2020-06-04189407332.7 ppb
2020-06-041894074ND
2020-06-041894075ND
2020-07-091903503349.0 ppb
2020-07-09190350415.4 ppb
2020-07-091903505294.0 ppb
2020-08-131913461217.0 ppb
2020-08-131913463ND
2020-08-131913464ND
2020-09-031919176ND
2020-09-031919177ND
2020-09-031919178170.0 ppb
2020-10-081930325162.0 ppb
2020-10-08193032682.3 ppb
2020-10-08193032738.1 ppb
2020-11-051937891353.0 ppb
2020-11-051937892ND
2020-11-05193789341.2 ppb
2020-12-031944675121.0 ppb
2020-12-031944676ND
2020-12-03194467713.0 ppb
2021-01-071953117198.0 ppb
2021-01-071953118ND
2021-01-07195311969.8 ppb
2021-02-111962645133.0 ppb
2021-02-111962646ND
2021-02-111962647ND
2021-03-041967324ND
2021-03-041967325ND
2021-03-041967326ND
2021-04-081977060159.0 ppb
2021-04-08197706145.9 ppb
2021-04-08197706276.5 ppb
2021-05-061985526155.0 ppb
2021-05-061985527ND
2021-05-061985528ND
2021-06-10199528377.8 ppb
2021-06-101995284ND
2021-06-101995285ND
2021-07-152005427ND
2021-07-152005428ND
2021-07-152005429ND
2021-08-122013924ND
2021-08-122013925ND
2021-08-122013926ND
2023-01-18216246221.4 ppb
2023-01-18216246312.3 ppb
2023-01-18216246417.6 ppb
2023-02-152170902433.0 ppb
2023-02-152170903223.0 ppb
2023-02-152170904412.0 ppb
2023-03-152179629721.0 ppb
2023-03-152179630299.0 ppb
2023-03-152179631517.0 ppb
2023-04-122187453529.0 ppb
2023-04-122187454323.0 ppb
2023-04-122187455434.0 ppb
2023-05-172197868588.0 ppb
2023-05-172197869394.0 ppb
2023-05-172197870345.0 ppb
2023-06-142205464ND
2023-06-14220546512.7 ppb
2023-06-14220546622.3 ppb
2023-07-262217421781.0 ppb
2023-07-262217422525.0 ppb
2023-07-262217423677.0 ppb
2023-08-162223460577.0 ppb
2023-08-162223461498.0 ppb
2023-08-162223462492.0 ppb
2023-09-202232924864.0 ppb
2023-09-202232925768.0 ppb
2023-09-202232926828.0 ppb
2023-10-182241187542.0 ppb
2023-10-182241188247.0 ppb
2023-10-182241189508.0 ppb
2023-11-15224884780.0 ppb
2023-11-15224884843.9 ppb
2023-11-15224884959.1 ppb
2023-12-13225649191.1 ppb
2023-12-132256492103.0 ppb
2023-12-13225649378.6 ppb