Know Your Environment. Protect Your Health.

Nitrate and nitrite

City of Sherwood

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.

 

0

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.508 ppm440.270 ppm - 0.810 ppm
20190.555 ppm440.300 ppm - 0.780 ppm
20200.475 ppm440.230 ppm - 0.920 ppm
20210.593 ppm330.320 ppm - 1.10 ppm
20220.665 ppm220.630 ppm - 0.700 ppm
20230.910 ppm110.910 ppm

ppm = parts per million

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.14 ppm

The EWG 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