Nitrite

Hemlock Farms (main)

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.

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Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2014	ND	5	ND
2015	ND	5	ND
2016	ND	5	ND
2017	ND	5	ND
2018	ND	5	ND
2019	ND	5	ND

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
2014-01-08	1312-01030	ND
2014-01-08	1312-01033	ND
2014-01-08	1312-01031	ND
2014-01-08	1312-01032	ND
2014-01-08	1312-01034	ND
2015-01-21	12304875	ND
2015-01-21	12304867	ND
2015-01-21	12304873	ND
2015-01-21	12304869	ND
2015-01-21	12304871	ND
2016-01-13	13771690	ND
2016-01-13	13771688	ND
2016-01-13	13771686	ND
2016-01-13	13771692	ND
2016-01-13	13771684	ND
2017-01-05	15539124	ND
2017-01-05	15539118	ND
2017-01-05	15539120	ND
2017-01-05	15539122	ND
2017-03-06	15816790	ND
2018-10-09	1712-01341	ND
2018-10-09	1712-01340	ND
2018-10-09	1712-01342	ND
2018-10-09	1712-01339	ND
2018-10-09	1712-01343	ND
2019-03-06	1812-00404	ND
2019-03-06	1812-00401	ND
2019-03-06	1812-00402	ND
2019-03-06	1812-00403	ND
2019-03-06	1812-00405	ND