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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

Hillview Water Company-oakhurst/sierra Lakes

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

 

24

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015N/A00N/A
20161.20 ppm43ND - 3.30 ppm
20170.284 ppm112ND - 2.20 ppm
2018ND70ND
20191.05 ppm21ND - 2.10 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
2016-12-065810-041-14440.990 ppm
2016-12-065810-040-14360.500 ppm
2016-12-065810-039-1428ND
2016-12-065810-017-14143.30 ppm
2017-03-285810-034-1106ND
2017-03-285810-033-1050ND
2017-03-285810-032-1045ND
2017-03-285810-031-1040ND
2017-03-285810-030-1030ND
2017-05-165810-002-09400.920 ppm
2017-05-165810-028-09062.20 ppm
2017-05-165810-010-1347ND
2017-05-165810-009-1341ND
2017-05-165810-007-1114ND
2017-05-165810-003-0920ND
2018-04-305810-024-1445ND
2018-04-305810-046-1410ND
2018-04-305810-047-1410ND
2018-04-305810-048-1432ND
2018-07-255810-010-1025ND
2018-07-255810-009-1000ND
2018-09-195810-001-0911ND
2019-12-115810-039-08502.10 ppm
2019-12-115810-041-0905ND