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EWG's Tap Water Database — 2021 UPDATE

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Nitrite

Pasadena

Nitrite, closely related to the fertilizer chemical nitrate, comes from urban runoff and from fertilizer applied to agricultural lands to pollute drinking water. Nitrite is significantly more toxic than nitrate. Excessive nitrite in water can cause oxygen deprivation in infants and increase the risk of cancer.

MORE ABOUT THIS CONTAMINANT

 

58

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND100ND
2015ND80ND
2016ND110ND
2017ND140ND
2018ND80ND
2019ND70ND

ppm = parts per million

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 1 ppm

The legal limit for nitrite, established in 1991, was based on the rate of conversion of ingested nitrate into nitrite in adults. This limit may not fully protect against the risk of cancer due to nitrite exposure.

ppm = parts per million

All test results

Date Lab ID Result
2014-08-123210-047-1030ND
2014-08-123210-045-1050ND
2014-08-123210-028-0845ND
2014-08-123210-023-0925ND
2014-08-123210-021-0945ND
2014-08-123210-018-1200ND
2014-08-123210-010-1000ND
2014-08-123210-006-0925ND
2014-08-123210-005-1030ND
2014-08-123210-001-0900ND
2015-09-223210-023-1000ND
2015-09-223210-001-1105ND
2015-09-223210-045-0940ND
2015-09-223210-018-0853ND
2015-09-259590-028-1100ND
2015-09-293210-005-0900ND
2015-10-203210-047-0000ND
2015-11-173210-021-0924ND
2016-06-143210-047-1025ND
2016-06-143210-045-0930ND
2016-06-143210-023-1200ND
2016-06-143210-028-1100ND
2016-06-143210-001-1045ND
2016-06-143210-018-0953ND
2016-06-143210-005-1115ND
2016-11-013210-019-0805ND
2016-11-109590-031-1308ND
2016-11-109590-030-1240ND
2016-11-109590-028-1326ND
2017-08-083210-045-0920ND
2017-08-083210-050-1055ND
2017-08-083210-051-1030ND
2017-08-083210-053-0849ND
2017-08-083210-047-1200ND
2017-08-083210-018-0930ND
2017-08-083210-023-1100ND
2017-08-083210-010-1300ND
2017-08-083210-006-1020ND
2017-08-083210-001-1215ND
2017-08-083210-019-0935ND
2017-08-083210-005-0935ND
2017-08-083210-028-1100ND
2017-08-083210-025-1115ND
2018-08-203210-019-1005ND
2018-08-213210-018-0925ND
2018-08-213210-001-0810ND
2018-08-213210-047-0938ND
2018-08-213210-045-0906ND
2018-08-213210-028-1100ND
2018-08-213210-023-1018ND
2018-08-273210-021-0831ND
2019-08-063210-047-1032ND
2019-08-063210-045-0912ND
2019-08-063210-005-0949ND
2019-08-063210-001-0905ND
2019-08-063210-023-1114ND
2019-08-073210-021-1136ND
2019-08-193210-019-0845ND