Nitrate and nitrite

Romeoville

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	0.157 ppm	6	3	ND - 0.756 ppm
2015	0.227 ppm	7	4	ND - 0.601 ppm
2016	0.216 ppm	7	3	ND - 0.636 ppm
2017	N/A	0	0	N/A
2018	0.458 ppm	2	2	0.151 ppm - 0.765 ppm
2019	N/A	0	0	N/A

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
2014-05-21	1405B75-002B	0.124 ppm
2014-05-21	1405B75-003B	ND
2014-05-21	1405B75-004B	ND
2014-05-21	1405B75-005B	0.756 ppm
2014-05-21	1405B75-006B	0.0631 ppm
2014-05-21	1405B75-001B	ND
2015-05-20	1505G05-005B	0.601 ppm
2015-05-20	1505G05-006B	ND
2015-05-20	1505G05-004B	ND
2015-05-20	1505G05-003B	0.136 ppm
2015-05-20	1505G05-002B	0.342 ppm
2015-07-09	1507758-001B	ND
2015-07-29	1507Q97-001B	0.511 ppm
2016-04-27	1604J08-001B	0.400 ppm
2016-04-27	1604J08-002B	ND
2016-04-27	1604J08-003B	ND
2016-04-27	1604J08-004B	ND
2016-04-27	1604J08-005B	0.479 ppm
2016-04-27	1604J08-006B	ND
2016-07-20	1607H14-001B	0.636 ppm
2018-08-16	18H0910-01_02	0.151 ppm
2018-11-14	18K0428-01_02	0.765 ppm