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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

California American Water Company - Parkway

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.

MORE ABOUT THIS CONTAMINANT

 

230

Samples

0

Samples exceeding legal limit (MCL)

122

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.93 ppm4426ND - 4.43 ppm
20150.892 ppm4215ND - 3.91 ppm
20160.691 ppm145ND - 3.35 ppm
20171.00 ppm2310ND - 3.75 ppm
20182.21 ppm7253ND - 6.60 ppm
20191.38 ppm3522ND - 3.90 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The EWG Health Guideline of 0.14 ppm for nitrate was defined by EWG . This health guideline protects against cancer and harm to fetal growth and development.

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
2014-01-221225-012-12104.23 ppm
2014-01-221225-030-12184.43 ppm
2014-02-261225-012-11224.24 ppm
2014-02-261225-030-11424.11 ppm
2014-03-111225-012-10504.22 ppm
2014-03-111225-030-11054.19 ppm
2014-04-081225-012-10564.26 ppm
2014-04-081225-030-11114.12 ppm
2014-05-065810-016-1030ND
2014-05-065810-021-1210ND
2014-05-065810-022-1225ND
2014-05-065810-023-1240ND
2014-05-075810-006-1020ND
2014-05-075810-018-1135ND
2014-05-075810-024-1100ND
2014-05-075810-026-1120ND
2014-05-085810-002-10520.813 ppm
2014-05-085810-008-10303.84 ppm
2014-05-085810-011-11321.99 ppm
2014-05-081225-012-08503.91 ppm
2014-05-085810-014-09452.03 ppm
2014-05-085810-015-12422.06 ppm
2014-05-081225-030-09003.89 ppm
2014-05-135810-013-13301.85 ppm
2014-06-251225-012-10103.78 ppm
2014-06-251225-030-10203.80 ppm
2014-08-051225-021-1145ND
2014-08-051225-022-1155ND
2014-08-051225-023-1210ND
2014-08-051225-025-1225ND
2014-08-111225-006-1140ND
2014-08-111225-016-0930ND
2014-08-111225-018-1205ND
2014-08-111225-024-1225ND
2014-08-111225-026-1110ND
2014-08-121225-002-09502.25 ppm
2014-08-121225-008-09203.53 ppm
2014-08-121225-011-11102.50 ppm
2014-08-121225-014-10302.51 ppm
2014-08-121225-015-11502.27 ppm
2014-08-121225-017-1115ND
2014-08-141225-013-08401.99 ppm
2014-12-181225-012-11004.14 ppm
2014-12-181225-030-11103.81 ppm
2015-07-151225-002-09402.38 ppm
2015-07-151225-002-09402.38 ppm
2015-07-151225-014-10303.73 ppm
2015-07-151225-014-10303.73 ppm
2015-07-151225-015-08402.30 ppm
2015-07-151225-015-08402.30 ppm
2015-07-151225-021-1040ND
2015-07-151225-021-1040ND
2015-07-151225-022-1110ND
2015-07-151225-022-1110ND
2015-07-151225-023-1135ND
2015-07-151225-023-1135ND
2015-07-151225-025-1225ND
2015-07-151225-025-1225ND
2015-07-151225-032-1020ND
2015-07-151225-032-1020ND
2015-07-151225-033-1205ND
2015-07-151225-033-1205ND
2015-07-151225-043-10150.540 ppm
2015-07-151225-043-10150.542 ppm
2015-07-151225-044-1155ND
2015-07-151225-044-1155ND
2015-07-201225-006-0950ND
2015-07-201225-006-0950ND
2015-07-201225-008-09303.79 ppm
2015-07-201225-008-09303.79 ppm
2015-07-201225-013-08452.02 ppm
2015-07-201225-013-08452.02 ppm
2015-07-201225-024-1150ND
2015-07-201225-024-1150ND
2015-07-201225-034-11300.130 ppm
2015-07-201225-034-1130ND
2015-07-201225-042-1115ND
2015-07-201225-042-1115ND
2015-07-221225-011-10453.91 ppm
2015-07-221225-011-10453.91 ppm
2015-07-221225-018-0925ND
2015-07-221225-018-0925ND
2015-07-221225-026-1000ND
2015-07-221225-026-1000ND
2015-07-291225-016-1015ND
2015-07-291225-016-1015ND
2016-07-061225-002-08152.37 ppm
2016-07-061225-008-07373.35 ppm
2016-07-061225-011-09001.51 ppm
2016-07-061225-015-10402.39 ppm
2016-07-121225-016-0915ND
2016-07-121225-017-0925ND
2016-07-121225-021-1015ND
2016-07-121225-022-1030ND
2016-07-121225-023-1000ND
2016-07-121225-025-1055ND
2016-07-251225-006-1150ND
2016-07-251225-018-11150.0500 ppm
2016-07-251225-026-1130ND
2016-07-271225-024-1130ND
2017-02-151225-032-1100ND
2017-02-151225-034-08490.01000 ppm
2017-02-151225-042-0847ND
2017-02-151225-043-1055ND
2017-04-121225-033-1251ND
2017-04-121225-044-1248ND
2017-08-151225-002-11252.57 ppm
2017-08-151225-008-12003.27 ppm
2017-08-151225-011-10301.69 ppm
2017-08-151225-015-09502.52 ppm
2017-08-151225-016-0934ND
2017-08-151225-017-1012ND
2017-08-161225-018-12230.0400 ppm
2017-08-161225-021-0853ND
2017-08-161225-023-0933ND
2017-08-161225-024-1141ND
2017-08-161225-025-0953ND
2017-08-161225-026-1206ND
2017-09-281225-013-11502.12 ppm
2017-12-061225-006-0955ND
2017-12-061225-014-13303.66 ppm
2017-12-191225-012-13003.75 ppm
2017-12-191225-030-12553.46 ppm
2018-01-101225-012-11053.78 ppm
2018-01-101225-030-11103.46 ppm
2018-02-131225-014-10253.26 ppm
2018-02-131225-022-0910ND
2018-02-131225-032-1005ND
2018-02-131225-043-1000ND
2018-02-141225-012-11233.81 ppm
2018-02-141225-030-11324.10 ppm
2018-02-191225-034-09200.0200 ppm
2018-02-191225-042-09050.0400 ppm
2018-03-121225-012-12183.77 ppm
2018-03-121225-030-12253.85 ppm
2018-03-121225-052-12404.41 ppm
2018-03-211225-050-12252.51 ppm
2018-03-211233-050-12252.30 ppm
2018-04-041225-012-11003.77 ppm
2018-04-041233-012-11002.90 ppm
2018-04-041225-014-10053.05 ppm
2018-04-041225-030-11153.84 ppm
2018-04-041233-030-11153.10 ppm
2018-04-041225-050-12352.56 ppm
2018-04-041233-050-12351.90 ppm
2018-04-041233-052-10153.00 ppm
2018-05-031225-012-10053.82 ppm
2018-05-031233-012-10203.20 ppm
2018-05-031233-030-10303.10 ppm
2018-05-031233-050-09352.20 ppm
2018-05-031233-052-10402.50 ppm
2018-05-031225-052-11182.96 ppm
2018-06-181225-012-12253.83 ppm
2018-06-181225-052-10503.09 ppm
2018-07-191233-012-10453.20 ppm
2018-07-191233-030-10553.10 ppm
2018-08-081233-002-11002.20 ppm
2018-08-081233-012-12102.90 ppm
2018-08-081233-030-12203.00 ppm
2018-08-091233-006-1140ND
2018-08-091233-016-0930ND
2018-08-091233-017-0835ND
2018-08-141233-008-11053.30 ppm
2018-08-141233-011-09001.40 ppm
2018-08-141233-013-11451.70 ppm
2018-08-141233-015-10202.10 ppm
2018-08-141233-021-1005ND
2018-08-141233-022-0910ND
2018-08-141233-023-0830ND
2018-08-141233-025-0740ND
2018-08-141233-050-11551.70 ppm
2018-08-151233-018-1210ND
2018-08-151233-024-1250ND
2018-08-151233-026-1210ND
2018-08-151233-032-0905ND
2018-08-151233-034-1335ND
2018-08-151233-042-1325ND
2018-08-151233-043-0855ND
2018-08-161233-033-0755ND
2018-08-161233-044-0745ND
2018-09-121233-050-13401.80 ppm
2018-09-181233-012-09353.40 ppm
2018-09-181233-030-09453.50 ppm
2018-10-101233-012-11304.00 ppm
2018-10-101233-030-11406.60 ppm
2018-10-111233-050-12152.30 ppm
2018-10-181233-029-12553.70 ppm
2018-10-231233-030-13303.80 ppm
2018-10-301233-030-11113.70 ppm
2018-11-061233-012-13403.40 ppm
2018-11-061233-030-13503.30 ppm
2018-11-061233-050-14552.10 ppm
2018-12-111233-012-13203.60 ppm
2018-12-111233-030-13303.40 ppm
2018-12-111233-050-12501.90 ppm
2019-01-171233-012-08203.90 ppm
2019-01-171233-030-08303.70 ppm
2019-01-171233-050-09502.10 ppm
2019-02-111225-034-1310ND
2019-02-111225-042-13050.0200 ppm
2019-02-181233-012-13153.60 ppm
2019-02-181233-030-13253.50 ppm
2019-02-181233-050-12352.00 ppm
2019-03-121233-050-13302.00 ppm
2019-04-101233-050-11051.90 ppm
2019-05-141233-050-14052.10 ppm
2019-06-181233-050-11402.20 ppm
2019-07-111233-050-14451.80 ppm
2019-08-051225-016-11300.01000 ppm
2019-08-051225-017-1110ND
2019-08-051225-033-1150ND
2019-08-051225-044-1135ND
2019-08-061225-002-13352.30 ppm
2019-08-061225-032-1050ND
2019-08-061225-043-1045ND
2019-08-071225-008-13103.75 ppm
2019-08-071225-011-14001.68 ppm
2019-08-071233-013-09052.40 ppm
2019-08-071225-013-12302.29 ppm
2019-08-071225-015-14452.36 ppm
2019-08-071233-050-09152.20 ppm
2019-08-131225-021-1040ND
2019-08-131225-022-1130ND
2019-08-131225-023-1115ND
2019-08-131225-025-1100ND
2019-08-151225-006-1240ND
2019-08-151225-018-14200.0300 ppm
2019-08-151225-024-1355ND
2019-08-151225-026-1435ND
2019-09-041233-050-13402.30 ppm