Know Your Environment. Protect Your Health.

Nitrate

Hillview Water Company-oakhurst/sierra Lakes

Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. Click here to read more about nitrate.

 

145

Samples

0

Samples exceeding legal limit (MCL)

32

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.311 ppm203ND - 2.80 ppm
20190.720 ppm204ND - 7.20 ppm
20200.488 ppm3912ND - 3.69 ppm
20210.447 ppm249ND - 3.94 ppm
20220.490 ppm208ND - 3.38 ppm
20230.526 ppm2212ND - 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

The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.

ppm = parts per million

All test results

Date Lab ID Result
2018-03-06CA2010007_031_031-201803061051ND
2018-03-06CA2010007_032_032-201803061052ND
2018-03-06CA2010007_033_033-201803061106ND
2018-03-06CA2010007_030_030-201803061015ND
2018-03-06CA2010007_034_034-201803061132ND
2018-04-30CA2010007_046_046-201804301410ND
2018-04-30CA2010007_048_048-201804301432ND
2018-04-30CA2010007_024_024-201804301445ND
2018-04-30CA2010007_047_047-201804301410ND
2018-05-08CA2010007_028_028-2018050809352.80 ppm
2018-05-08CA2010007_007_007-201805081000ND
2018-05-08CA2010007_017_017-2018050809332.50 ppm
2018-05-09CA2010007_002_002-2018050909500.910 ppm
2018-05-09CA2010007_001_001-201805090905ND
2018-05-25CA2010007_003_003-201805251022ND
2018-07-25CA2010007_010_010-201807251025ND
2018-07-25CA2010007_009_009-201807251000ND
2018-09-19CA2010007_001_001-201809190911ND
2018-11-06CA2010007_039_039-201811061421ND
2018-12-19CA2010007_041_041-201812191012ND
2019-01-08CA2010007_032_032-201901081130ND
2019-01-08CA2010007_033_033-201901081133ND
2019-01-08CA2010007_034_034-201901081052ND
2019-01-08CA2010007_030_030-201901081110ND
2019-01-08CA2010007_031_031-201901081115ND
2019-01-29CA2010007_051_051-201901290950ND
2019-03-06CA2010007_039_039-2019030611051.90 ppm
2019-04-10CA2010007_046_046-201904100946ND
2019-04-10CA2010007_047_047-201904100952ND
2019-04-10CA2010007_048_048-201904101012ND
2019-04-10CA2010007_024_024-2019041010167.20 ppm
2019-05-08CA2010007_003_003-201905080846ND
2019-05-08CA2010007_007_007-201905080941ND
2019-05-08CA2010007_002_002-201905080900ND
2019-05-08CA2010007_028_028-2019050809303.20 ppm
2019-06-12CA2010007_010_010-201906120940ND
2019-06-12CA2010007_009_009-201906120936ND
2019-09-09CA2010007_001_001-201909090853ND
2019-12-11CA2010007_041_041-201912110905ND
2019-12-11CA2010007_039_039-2019121108502.10 ppm
2020-01-20CA2010007_032_032-202001201004ND
2020-01-20CA2010007_033_033-202001201015ND
2020-01-20CA2010007_030_030-202001200941ND
2020-01-20CA2010007_031_031-202001200954ND
2020-01-20CA2010007_034_034-202001200941ND
2020-03-09CA2010007_031_031-202003090930ND
2020-03-09CA2010007_030_030-202003090914ND
2020-03-09CA2010007_039_039-2020030909471.70 ppm
2020-03-09CA2010007_017_017-2020030910502.70 ppm
2020-03-09CA2010007_032_032-202003090945ND
2020-03-09CA2010007_033_033-202003091000ND
2020-03-23CA2010007_034_034-202003231015ND
2020-04-06CA2010007_024_024-202004061024ND
2020-04-06CA2010007_048_048-202004061008ND
2020-04-06CA2010007_028_028-2020040607581.20 ppm
2020-04-06CA2010007_047_047-202004060950ND
2020-04-06CA2010007_046_046-202004060934ND
2020-05-04CA2010007_028_028-2020050410252.70 ppm
2020-05-04CA2010007_003_003-202005041000ND
2020-05-04CA2010007_002_002-2020050410110.470 ppm
2020-05-05CA2010007_007_007-202005050814ND
2020-06-09CA2010007_009_009-202006090951ND
2020-06-09CA2010007_010_010-202006090957ND
2020-08-04CA2010007_001_001-202008041240ND
2020-08-20CA2010007_002_002-2020082013430.140 ppm
2020-08-20CA2010007_039_039-2020082012301.26 ppm
2020-08-20CA2010007_047_047-202008201025ND
2020-08-20CA2010007_030_030-2020082011270.0300 ppm
2020-08-20CA2010007_034_034-202008201112ND
2020-08-20CA2010007_041_041-2020082012152.18 ppm
2020-08-20CA2010007_046_046-202008201005ND
2020-08-20CA2010007_007_007-202008201102ND
2020-08-20CA2010007_031_031-202008201141ND
2020-08-20CA2010007_048_048-2020082009500.0400 ppm
2020-08-20CA2010007_003_003-202008201354ND
2020-08-20CA2010007_017_017-2020082008202.94 ppm
2020-08-20CA2010007_028_028-2020082011323.69 ppm
2020-08-20CA2010007_032_032-202008201148ND
2020-08-20CA2010007_033_033-202008201155ND
2021-02-17CA2010007_040_040-2021021711050.660 ppm
2021-08-11CA2010007_048_048-202108110908ND
2021-08-11CA2010007_002_002-2021081108080.0400 ppm
2021-08-11CA2010007_003_003-202108110708ND
2021-08-16CA2010007_009_009-202108160908ND
2021-08-16CA2010007_047_047-202108160908ND
2021-08-16CA2010007_024_024-202108160908ND
2021-08-16CA2010007_032_032-202108160908ND
2021-08-16CA2010007_041_041-2021081609081.51 ppm
2021-08-16CA2010007_007_007-202108160808ND
2021-08-16CA2010007_010_010-2021081609080.0200 ppm
2021-08-16CA2010007_031_031-202108160908ND
2021-08-16CA2010007_001_001-2021081608080.0400 ppm
2021-08-16CA2010007_030_030-202108160808ND
2021-08-16CA2010007_033_033-202108160908ND
2021-08-16CA2010007_034_034-202108160808ND
2021-08-16CA2010007_039_039-2021081608081.19 ppm
2021-08-16CA2010007_046_046-202108160908ND
2021-08-25CA2010007_017_017-2021082507083.31 ppm
2021-09-01CA2010007_028_028-2021090113093.94 ppm
2021-09-28CA2010007_048_048-202109280902ND
2021-09-28CA2010007_047_047-202109280858ND
2021-09-28CA2010007_014_014-202109280800ND
2021-09-28CA2010007_051_051-2021092807570.01000 ppm
2022-06-06CA2010007_007_007-202206061114ND
2022-06-06CA2010007_009_009-202206061229ND
2022-06-06CA2010007_030_030-2022060611370.0300 ppm
2022-06-06CA2010007_032_032-202206061138ND
2022-06-06CA2010007_033_033-202206061208ND
2022-06-06CA2010007_039_039-2022060613501.15 ppm
2022-06-06CA2010007_041_041-2022060614040.880 ppm
2022-06-06CA2010007_034_034-202206061125ND
2022-06-06CA2010007_040_040-2022060613300.990 ppm
2022-06-06CA2010007_010_010-2022060612340.0300 ppm
2022-06-06CA2010007_031_031-202206061130ND
2022-06-06CA2010007_017_017-2022060613053.29 ppm
2022-06-06CA2010007_028_028-2022060612503.38 ppm
2022-06-07CA2010007_001_001-202206070814ND
2022-06-07CA2010007_002_002-2022060708230.0500 ppm
2022-06-07CA2010007_024_024-202206071005ND
2022-06-07CA2010007_048_048-202206070942ND
2022-06-07CA2010007_003_003-202206070834ND
2022-06-07CA2010007_046_046-202206070922ND
2022-06-07CA2010007_047_047-202206070932ND
2023-06-05CA2010007_010_010-2023060510290.0400 ppm
2023-06-05CA2010007_039_039-2023060511170.250 ppm
2023-06-05CA2010007_040_040-2023060510312.10 ppm
2023-06-05CA2010007_007_007-202306050915ND
2023-06-05CA2010007_033_033-202306050958ND
2023-06-05CA2010007_030_030-2023060509350.0200 ppm
2023-06-05CA2010007_031_031-202306050945ND
2023-06-05CA2010007_041_041-2023060510120.370 ppm
2023-06-05CA2010007_009_009-2023060509090.0600 ppm
2023-06-05CA2010007_032_032-202306050951ND
2023-06-05CA2010007_034_034-202306051015ND
2023-06-06CA2010007_002_002-2023060608220.660 ppm
2023-06-06CA2010007_013_013-2023060610000.01000 ppm
2023-06-06CA2010007_028_028-2023060610144.33 ppm
2023-06-06CA2010007_003_003-202306060851ND
2023-06-06CA2010007_017_017-2023060609583.66 ppm
2023-06-06CA2010007_051_051-2023060608200.0400 ppm
2023-06-14CA2010007_001_001-202306141110ND
2023-06-14CA2010007_024_024-2023061409400.0400 ppm
2023-06-14CA2010007_047_047-202306141010ND
2023-06-14CA2010007_048_048-202306140958ND
2023-07-19CA2010007_046_046-202307190909ND