Nitrate

South Martin Regional Utilities

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
2014	0.594 ppm	6	3	ND - 1.40 ppm
2015	0.438 ppm	4	2	ND - 0.902 ppm
2016	0.377 ppm	4	3	ND - 0.709 ppm
2017	0.292 ppm	4	2	ND - 0.650 ppm
2018	0.191 ppm	4	2	ND - 0.459 ppm
2019	0.365 ppm	4	4	0.0750 ppm - 0.653 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	Result
2014-01-21	1.40 ppm
2014-01-21	ND
2014-05-28	ND
2014-05-28	1.39 ppm
2014-07-16	ND
2014-07-16	0.772 ppm
2015-01-14	0.851 ppm
2015-01-14	ND
2015-07-21	ND
2015-07-21	0.902 ppm
2016-01-25	0.709 ppm
2016-01-25	0.207 ppm
2016-07-11	ND
2016-07-11	0.591 ppm
2017-01-24	0.516 ppm
2017-01-24	ND
2017-05-15	ND
2017-05-15	0.650 ppm
2018-01-24	ND
2018-01-24	0.306 ppm
2018-07-19	0.459 ppm
2018-07-19	ND
2019-07-23	0.0750 ppm
2019-07-23	0.636 ppm
2019-07-23	0.653 ppm
2019-07-23	0.0950 ppm