Nitrate

City of Antioch

Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. Click here to read more about nitrate.

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2013	N/A	0	0	N/A
2014	0.0994 ppm	5	1	ND - 0.497 ppm
2015	0.152 ppm	4	1	ND - 0.610 ppm
2016	0.260 ppm	2	1	ND - 0.520 ppm
2017	N/A	0	0	N/A
2018	0.150 ppm	3	1	ND - 0.450 ppm
2019	0.400 ppm	3	1	ND - 0.800 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The EWG Health Guideline of 0.14 ppm for nitrate was defined by EWG . This health guideline protects against cancer and harm to fetal growth and development.

EPA Maximum Contaminant
Level (MCL) 10 ppm

The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.

ppm = parts per million

All test results

Date	Lab ID	Result
2014-03-06	9590-001-1030	0.497 ppm
2014-04-07	2473-005-0740	ND
2014-07-07	2473-005-0755	ND
2014-07-22	2473-005-1345	ND
2014-11-06	9590-001-1100	ND
2015-03-12	9590-001-1130	0.610 ppm
2015-07-06	2473-005-0826	ND
2015-07-06	2473-005-0815	ND
2015-10-14	9590-001-1200	ND
2016-03-08	9590-001-1230	0.520 ppm
2016-10-27	9590-001-1200	ND
2018-03-05	9590-001-0741	0.450 ppm
2018-06-04	9590-001-1206	ND
2018-07-18	1644-009-0955	ND
2019-06-01		0.400 ppm*
2019-06-06	9590-001-0800	ND
2019-09-10	9590-001-1148	ND

* Sample result is taken from the system's CCR report.