Know Your Environment. Protect Your Health.

Nitrate and nitrite

City of Hillsboro

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
20180.290 ppm220.0400 ppm - 0.540 ppm
20190.180 ppm220.0400 ppm - 0.320 ppm
20200.150 ppm21ND - 0.300 ppm
20210.220 ppm220.200 ppm - 0.240 ppm
20220.185 ppm220.0500 ppm - 0.320 ppm
20230.440 ppm220.350 ppm - 0.530 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