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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

Calleguas Municipal Water District

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.

 

123

Samples

0

Samples exceeding legal limit (MCL)

54

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.140 ppm2115ND - 0.474 ppm
20150.171 ppm2713ND - 0.723 ppm
20160.437 ppm1915ND - 1.10 ppm
20170.345 ppm2011ND - 1.20 ppm
20180.187 ppm156ND - 0.600 ppm
20190.138 ppm215ND - 0.900 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
2014-01-105867-006-09450.113 ppm
2014-01-105867-010-11300.181 ppm
2014-03-215867-007-11250.113 ppm
2014-03-215867-020-10450.0904 ppm
2014-03-285867-023-10500.120 ppm
2014-04-115867-009-1010ND
2014-04-115867-018-1100ND
2014-04-185867-011-10300.203 ppm
2014-04-185867-022-09450.136 ppm
2014-05-075867-004-09150.181 ppm
2014-05-085867-014-11100.271 ppm
2014-05-085867-014-11160.271 ppm
2014-05-085867-015-1015ND
2014-05-085867-016-10400.248 ppm
2014-05-085867-017-1055ND
2014-05-085867-020-1300ND
2014-11-175867-012-11100.294 ppm
2014-11-175867-013-15500.0904 ppm
2014-11-175867-019-14400.158 ppm
2014-11-185867-008-1315ND
2014-11-195867-021-10100.474 ppm
2015-02-025867-004-0815ND
2015-02-195867-006-14550.723 ppm
2015-02-195867-017-14150.678 ppm
2015-02-205867-007-12200.452 ppm
2015-02-205867-007-12300.565 ppm
2015-02-205867-011-14000.158 ppm
2015-02-205867-016-13150.384 ppm
2015-10-215867-014-10200.300 ppm
2015-10-215867-014-10200.316 ppm
2015-10-225867-023-10500.1000 ppm
2015-10-275867-012-1030ND
2015-10-275867-012-1030ND
2015-10-275867-015-1300ND
2015-10-275867-015-1300ND
2015-10-275867-016-1130ND
2015-10-275867-016-1130ND
2015-11-045867-004-1340ND
2015-11-045867-004-1340ND
2015-11-055867-013-11400.1000 ppm
2015-11-055867-013-11400.136 ppm
2015-11-055867-021-14000.400 ppm
2015-11-055867-022-1210ND
2015-11-125867-008-1120ND
2015-11-125867-009-1230ND
2015-11-125867-010-1250ND
2015-11-125867-018-14050.300 ppm
2015-11-125867-019-1045ND
2016-01-155867-012-09300.600 ppm
2016-01-215867-013-09401.000 ppm
2016-01-215867-014-10250.900 ppm
2016-01-295867-016-0930ND
2016-02-015867-017-15001.10 ppm
2016-02-045867-009-10300.1000 ppm
2016-02-195867-010-10400.600 ppm
2016-04-045867-004-08400.1000 ppm
2016-04-055867-011-11250.700 ppm
2016-04-055867-022-09300.300 ppm
2016-04-055867-023-10000.300 ppm
2016-04-065867-018-1100ND
2016-04-065867-019-10300.300 ppm
2016-04-065867-020-1305ND
2016-04-065867-021-11500.400 ppm
2016-04-075867-006-11550.800 ppm
2016-04-075867-007-13000.600 ppm
2016-04-075867-008-13400.500 ppm
2016-11-075867-004-0745ND
2017-03-215867-004-1040ND
2017-04-175867-008-1005ND
2017-04-175867-009-1245ND
2017-04-185867-006-1130ND
2017-04-185867-020-12500.500 ppm
2017-04-195867-011-1050ND
2017-04-205867-016-12401.000 ppm
2017-04-205867-017-1010ND
2017-09-265867-018-1105ND
2017-09-275867-013-1040ND
2017-09-275867-014-11001.20 ppm
2017-10-165867-004-0855ND
2017-11-065867-007-10150.600 ppm
2017-11-065867-010-11200.500 ppm
2017-11-135867-012-10210.500 ppm
2017-11-135867-015-12450.700 ppm
2017-11-135867-019-10020.500 ppm
2017-11-135867-021-11090.500 ppm
2017-11-205867-022-11000.400 ppm
2017-11-205867-023-12000.500 ppm
2018-02-135867-015-10500.400 ppm
2018-02-135867-016-09450.400 ppm
2018-02-135867-018-11350.600 ppm
2018-02-135867-019-12400.600 ppm
2018-02-265867-004-0915ND
2018-03-055867-007-1300ND
2018-03-055867-008-1330ND
2018-03-065867-010-13450.400 ppm
2018-03-075867-006-14000.400 ppm
2018-03-075867-011-1100ND
2018-03-075867-013-1320ND
2018-03-085867-012-1000ND
2018-03-085867-014-1330ND
2018-04-305867-017-1030ND
2018-11-055867-004-0820ND
2019-01-295867-004-0930ND
2019-02-015867-012-0902ND
2019-02-015867-016-0932ND
2019-02-045867-011-10200.400 ppm
2019-02-045867-018-0945ND
2019-02-055867-014-1115ND
2019-02-055867-022-10200.900 ppm
2019-02-055867-023-0945ND
2019-02-065867-015-1230ND
2019-02-075867-020-0840ND
2019-02-115867-006-1030ND
2019-02-115867-008-11050.400 ppm
2019-02-115867-021-0930ND
2019-02-195867-007-1200ND
2019-02-195867-009-1300ND
2019-02-195867-010-12300.700 ppm
2019-02-195867-019-1100ND
2019-02-205867-013-1145ND
2019-02-205867-017-1045ND
2019-09-235867-019-09430.500 ppm
2019-11-045867-004-0800ND