Nitrate and nitrite

Culvers Hill - North Webster

Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. 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	N/A	0	0	N/A
2015	N/A	0	0	N/A
2016	N/A	0	0	N/A
2017	0.146 ppm	10	2	ND - 1.10 ppm
2018	4.39 ppm	13	7	ND - 15.5 ppm
2019	3.05 ppm	2	1	ND - 6.10 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.

EPA Maximum Contaminant
Level (MCL) 10 ppm

ppm = parts per million

All test results

Date	Lab ID	Result
2017-12-01	17120069002AN	ND
2017-12-01	17120069001AN	ND
2017-12-01	17120069010AN	ND
2017-12-01	17120069009AN	1.10 ppm
2017-12-01	17120069008AN	0.360 ppm
2017-12-01	17120069007AN	ND
2017-12-01	17120069006AN	ND
2017-12-01	17120069005AN	ND
2017-12-01	17120069004AN	ND
2017-12-01	17120069003AN	ND
2018-08-03	18080475010AN	ND
2018-08-03	18080475009AN	1.30 ppm
2018-08-03	18080475008AN	0.600 ppm
2018-08-03	18080475007AN	5.00 ppm
2018-08-03	18080475006AN	15.0 ppm
2018-08-03	18080475005AN	ND
2018-08-03	18080475004AN	ND
2018-08-03	18080475003AN	ND
2018-08-03	18080475002AN	ND
2018-08-03	18080475001AN	ND
2018-09-27	18093579N	15.0 ppm
2018-11-20	18112331002AN	4.70 ppm
2018-11-20	18112331001AN	15.5 ppm
2019-03-29	19040078002N	6.10 ppm
2019-03-29	19040078001N	ND