Nitrite

City of Hollister

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

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2013	N/A	0	N/A
2014	ND	6	ND
2015	N/A	0	N/A
2016	N/A	0	N/A
2017	ND	5	ND
2018	N/A	0	N/A
2019	ND	18	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
2014-06-12	1610-009-1055	ND
2014-06-12	1610-007-1250	ND
2014-06-12	1610-006-1315	ND
2014-06-12	1610-005-1015	ND
2014-06-12	1610-002-1145	ND
2014-06-12	1610-001-1205	ND
2017-06-01	1610-002-1045	ND
2017-06-01	1610-001-1011	ND
2017-06-08	1610-005-1150	ND
2017-06-08	1610-007-0916	ND
2017-06-08	1610-006-1236	ND
2019-01-10	1610-007-0843	ND
2019-01-10	1610-006-0835	ND
2019-03-14	1610-006-0944	ND
2019-03-14	1610-007-0910	ND
2019-04-11	1610-006-0907	ND
2019-04-11	1610-005-0848	ND
2019-04-11	1610-007-0833	ND
2019-04-11	1610-002-1100	ND
2019-04-11	1610-001-1130	ND
2019-09-10	1610-005-0953	ND
2019-09-10	1610-007-0830	ND
2019-09-10	1610-002-0904	ND
2019-09-10	1610-001-0913	ND
2019-10-15	1610-005-1007	ND
2019-10-15	1610-007-0926	ND
2019-10-15	1610-002-1054	ND
2019-10-15	1610-001-1046	ND
2019-12-05	1610-007-1215	ND