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EWG's Tap Water Database — 2021 UPDATE

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Chlorite

Town of Smithfield

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.

MORE ABOUT THIS CONTAMINANT

 

141

Samples

0

Samples exceeding legal limit (MCL)

120

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015N/A00N/A
2016344.8 ppb3333190.0 ppb - 700.0 ppb
2017293.6 ppb3624ND - 830.0 ppb
2018427.5 ppb3627ND - 820.0 ppb
2019591.1 ppb3636290.0 ppb - 720.0 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

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
2016-05-1937729_16-15899520.0 ppb
2016-05-2637729_16-16705390.0 ppb
2016-05-2637729_16-16706380.0 ppb
2016-05-2637729_16-16707400.0 ppb
2016-05-2637729_16-16708370.0 ppb
2016-05-2637729_16-16709550.0 ppb
2016-06-2237729_16-20493480.0 ppb
2016-06-2237729_16-20494450.0 ppb
2016-06-2237729_16-20495700.0 ppb
2016-07-2737729_16-25149410.0 ppb
2016-07-2737729_16-25150220.0 ppb
2016-07-2737729_16-25151260.0 ppb
2016-08-0337729_16-26408420.0 ppb
2016-08-0437729_16-26410460.0 ppb
2016-08-1037729_16-27534410.0 ppb
2016-08-1037729_16-27535350.0 ppb
2016-08-1037729_16-27536320.0 ppb
2016-08-1137729_16-27537530.0 ppb
2016-09-0737729_16-31158190.0 ppb
2016-09-0737729_16-31163250.0 ppb
2016-09-0737729_16-31165220.0 ppb
2016-10-2737729_16-37556280.0 ppb
2016-10-2737729_16-37557270.0 ppb
2016-10-2737729_16-37558270.0 ppb
2016-11-0337729_16-38413230.0 ppb
2016-11-0337729_16-38414220.0 ppb
2016-11-0337729_16-38415200.0 ppb
2016-11-1737729_16-40350290.0 ppb
2016-11-1737729_16-40351220.0 ppb
2016-11-1737729_16-40343310.0 ppb
2016-12-0837729_16-42743280.0 ppb
2016-12-0837729_16-42744250.0 ppb
2016-12-0837729_16-42745280.0 ppb
2017-01-2537729_17-03131440.0 ppb
2017-01-2537729_17-03132340.0 ppb
2017-01-2537729_17-03133320.0 ppb
2017-02-1637729_17-05683380.0 ppb
2017-02-1637729_17-05671380.0 ppb
2017-02-1637729_17-05682400.0 ppb
2017-03-3037729_17-10755320.0 ppb
2017-03-3037729_17-10756320.0 ppb
2017-03-3037729_17-10754340.0 ppb
2017-04-2037729_17-13346350.0 ppb
2017-04-2037729_17-13347310.0 ppb
2017-04-2037729_17-13345500.0 ppb
2017-05-2537729_17-17478350.0 ppb
2017-05-2537729_17-17479510.0 ppb
2017-05-2537729_17-17480340.0 ppb
2017-06-2237729_17-22252590.0 ppb
2017-06-2237729_17-22253340.0 ppb
2017-06-2237729_17-22254390.0 ppb
2017-07-2037729_17-25599400.0 ppb
2017-07-2037729_17-25605640.0 ppb
2017-07-2037729_17-25603630.0 ppb
2017-08-1737729_17-29637830.0 ppb
2017-08-1737729_17-29638600.0 ppb
2017-08-1737729_17-29639550.0 ppb
2017-09-2737729_17-36616ND
2017-09-2737729_17-36617ND
2017-09-2737729_17-36618ND
2017-10-2637729_17-40523ND
2017-10-2637729_17-40524ND
2017-10-2637729_17-40522ND
2017-11-2037729_17-44459ND
2017-11-2037729_17-44460ND
2017-11-2037729_17-44461ND
2017-12-2037729_17-49224ND
2017-12-2037729_17-49225ND
2017-12-2037729_17-49226ND
2018-01-2537729_18-03481 ND
2018-01-2537729_18-03483 ND
2018-01-2537729_18-03484 ND
2018-02-1437729_18-06251 ND
2018-02-1437729_18-06252 ND
2018-02-1437729_18-06253 ND
2018-03-0137729_18-08046 ND
2018-03-0137729_18-08049 ND
2018-03-0137729_18-08050 ND
2018-04-2637729_18-16665 390.0 ppb
2018-04-2637729_18-16667 410.0 ppb
2018-04-2637729_18-16668 460.0 ppb
2018-05-1737729_18-19728 510.0 ppb
2018-05-1737729_18-19729 530.0 ppb
2018-05-1737729_18-19730 710.0 ppb
2018-06-2837729_18-26363 650.0 ppb
2018-06-2837729_18-26364 630.0 ppb
2018-06-2837729_18-26365 610.0 ppb
2018-07-1937729_18-29675 680.0 ppb
2018-07-1937729_18-29676 620.0 ppb
2018-07-1937729_18-29677 680.0 ppb
2018-08-1637729_18-34238 760.0 ppb
2018-08-1637729_18-34239 740.0 ppb
2018-08-1637729_18-34240 820.0 ppb
2018-09-2037729_18-40208 730.0 ppb
2018-09-2037729_18-40209 690.0 ppb
2018-09-2037729_18-40210 650.0 ppb
2018-10-2537729_18-44544 380.0 ppb
2018-10-2537729_18-44545 400.0 ppb
2018-10-2537729_18-44546 390.0 ppb
2018-11-2037729_18-49135 580.0 ppb
2018-11-2037729_18-49136 420.0 ppb
2018-11-2037729_18-49137 410.0 ppb
2018-12-1337729_18-52215 520.0 ppb
2018-12-1337729_18-52216 520.0 ppb
2018-12-1337729_18-52217 500.0 ppb
2019-01-2437729_19-03570 560.0 ppb
2019-01-2437729_19-03571 540.0 ppb
2019-01-2437729_19-03572 520.0 ppb
2019-02-2837729_19-08608 470.0 ppb
2019-02-2837729_19-08612 480.0 ppb
2019-02-2837729_19-08613 430.0 ppb
2019-03-1437729_19-10850 340.0 ppb
2019-03-1437729_19-10851 300.0 ppb
2019-03-1437729_19-10852 290.0 ppb
2019-04-1837729_19-16918 630.0 ppb
2019-04-1837729_19-16919 620.0 ppb
2019-04-1837729_19-16920 610.0 ppb
2019-05-2337729_19-22091 610.0 ppb
2019-05-2337729_19-22095 590.0 ppb
2019-05-2337729_19-22096 600.0 ppb
2019-06-2737729_19-27966 710.0 ppb
2019-06-2737729_19-27967 680.0 ppb
2019-06-2737729_19-27968 690.0 ppb
2019-07-2437729_19-31438 620.0 ppb
2019-07-2437729_19-31442 620.0 ppb
2019-07-2437729_19-31443 630.0 ppb
2019-08-2937729_19-37590 640.0 ppb
2019-08-2937729_19-37591 680.0 ppb
2019-08-2937729_19-37592 720.0 ppb
2019-09-2637729_19-41928 670.0 ppb
2019-09-2637729_19-41929 670.0 ppb
2019-09-2637729_19-41930 670.0 ppb
2019-10-1733755-1 668.0 ppb
2019-10-1733755-2 677.0 ppb
2019-10-1733755-3 693.0 ppb
2019-11-2137729_19-50155 530.0 ppb
2019-11-2137729_19-50156 520.0 ppb
2019-11-2137729_19-50157 530.0 ppb
2019-12-1937729_19-54431 710.0 ppb
2019-12-1937729_19-54432 690.0 ppb
2019-12-1937729_19-54433 670.0 ppb