Nitrate

Roy City Water System

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	0.567 ppm	3	3	0.200 ppm - 1.000 ppm
2015	0.900 ppm	3	3	0.700 ppm - 1.000 ppm
2016	0.750 ppm	4	4	0.200 ppm - 1.30 ppm
2017	0.700 ppm	4	4	0.200 ppm - 1.10 ppm
2018	0.776 ppm	4	4	0.373 ppm - 1.20 ppm
2019	0.755 ppm	4	4	0.148 ppm - 1.30 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
2014-08-08	0.500 ppm
2014-08-08	1.000 ppm
2014-08-08	0.200 ppm
2015-09-18	1.000 ppm
2015-09-18	0.700 ppm
2015-09-18	1.000 ppm
2016-02-04	0.400 ppm
2016-02-04	1.10 ppm
2016-02-04	1.30 ppm
2016-02-04	0.200 ppm
2017-03-15	0.200 ppm
2017-03-15	1.000 ppm
2017-03-15	0.500 ppm
2017-03-17	1.10 ppm
2018-03-20	0.373 ppm
2018-03-20	1.20 ppm
2018-03-20	0.983 ppm
2018-03-20	0.543 ppm
2019-01-15	0.596 ppm
2019-01-15	0.148 ppm
2019-01-15	0.975 ppm
2019-01-15	1.30 ppm