Know Your Environment. Protect Your Health.

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.

 

58

Samples

0

Samples exceeding legal limit (MCL)

13

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND70ND
20191.05 ppm21ND - 2.10 ppm
20200.725 ppm227ND - 3.69 ppm
20210.0550 ppm121ND - 0.660 ppm
2022N/A00N/A
20230.717 ppm154ND - 4.33 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
2018-04-30CA2010007_024_024-201804301445ND
2018-04-30CA2010007_046_046-201804301410ND
2018-04-30CA2010007_047_047-201804301410ND
2018-04-30CA2010007_048_048-201804301432ND
2018-07-25CA2010007_009_009-201807251000ND
2018-07-25CA2010007_010_010-201807251025ND
2018-09-19CA2010007_001_001-201809190911ND
2019-12-11CA2010007_039_039-2019121108502.10 ppm
2019-12-11CA2010007_041_041-201912110905ND
2020-03-09CA2010007_030_030-202003090914ND
2020-03-09CA2010007_031_031-202003090930ND
2020-03-09CA2010007_032_032-202003090945ND
2020-03-09CA2010007_017_017-2020030910502.70 ppm
2020-03-09CA2010007_033_033-202003091000ND
2020-03-23CA2010007_034_034-202003231015ND
2020-05-04CA2010007_002_002-2020050410110.470 ppm
2020-05-04CA2010007_028_028-2020050410252.70 ppm
2020-05-04CA2010007_003_003-202005041000ND
2020-05-05CA2010007_007_007-202005050814ND
2020-08-20CA2010007_017_017-2020082008202.94 ppm
2020-08-20CA2010007_002_002-202008201343ND
2020-08-20CA2010007_007_007-202008201102ND
2020-08-20CA2010007_033_033-202008201155ND
2020-08-20CA2010007_031_031-202008201141ND
2020-08-20CA2010007_039_039-2020082012301.26 ppm
2020-08-20CA2010007_032_032-202008201148ND
2020-08-20CA2010007_030_030-202008201127ND
2020-08-20CA2010007_041_041-2020082012152.18 ppm
2020-08-20CA2010007_034_034-202008201112ND
2020-08-20CA2010007_028_028-2020082011323.69 ppm
2020-08-20CA2010007_003_003-202008201354ND
2021-02-17CA2010007_040_040-2021021711050.660 ppm
2021-08-11CA2010007_048_048-202108110908ND
2021-08-16CA2010007_001_001-202108160808ND
2021-08-16CA2010007_010_010-202108160908ND
2021-08-16CA2010007_046_046-202108160908ND
2021-08-16CA2010007_047_047-202108160908ND
2021-08-16CA2010007_024_024-202108160908ND
2021-08-16CA2010007_009_009-202108160908ND
2021-09-28CA2010007_047_047-202109280858ND
2021-09-28CA2010007_014_014-202109280800ND
2021-09-28CA2010007_051_051-202109280757ND
2021-09-28CA2010007_048_048-202109280902ND
2023-06-05CA2010007_041_041-202306051012ND
2023-06-05CA2010007_033_033-202306050958ND
2023-06-05CA2010007_030_030-202306050935ND
2023-06-05CA2010007_040_040-2023060510312.10 ppm
2023-06-05CA2010007_039_039-202306051117ND
2023-06-05CA2010007_034_034-202306051015ND
2023-06-05CA2010007_032_032-202306050951ND
2023-06-05CA2010007_007_007-202306050915ND
2023-06-05CA2010007_031_031-202306050945ND
2023-06-06CA2010007_013_013-202306061000ND
2023-06-06CA2010007_003_003-202306060851ND
2023-06-06CA2010007_017_017-2023060609583.66 ppm
2023-06-06CA2010007_028_028-2023060610144.33 ppm
2023-06-06CA2010007_002_002-2023060608220.660 ppm
2023-06-06CA2010007_051_051-202306060820ND