Know Your Environment. Protect Your Health.

Nitrate and nitrite

Willow Grove Mill

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.

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20182.95 ppm1614ND - 4.74 ppm
20193.30 ppm1714ND - 7.94 ppm
20203.19 ppm1714ND - 7.81 ppm
20213.41 ppm1714ND - 7.89 ppm
2022ND70ND
2023ND130ND

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
2022-07-12S1183784ND
2022-08-02S1183786ND
2022-09-13S1220496ND
2022-10-06S1220524ND
2022-11-08S1220574ND
2022-11-15S1220588ND
2022-12-06S1220602ND
2023-01-03S1235156ND
2023-02-07S1235193ND
2023-03-07S1235228ND
2023-04-04S1235258ND
2023-05-03S1235306ND
2023-06-06S1235338ND
2023-07-18S1235386ND
2023-08-01S1235407ND
2023-09-05S1235446ND
2023-09-22S1159257ND
2023-10-02S1235492ND
2023-11-07S1235532ND
2023-12-05S1235558ND