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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

Atascadero Mutual Water Company

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

 

260

Samples

0

Samples exceeding legal limit (MCL)

220

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.836 ppm3023ND - 3.61 ppm
20150.724 ppm3322ND - 2.10 ppm
20160.800 ppm7258ND - 3.70 ppm
20171.55 ppm5755ND - 4.00 ppm
20181.47 ppm2826ND - 4.60 ppm
20191.51 ppm4036ND - 3.20 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
2014-01-143761-007-08370.723 ppm
2014-01-143761-023-08220.474 ppm
2014-01-143761-050-08301.06 ppm
2014-02-113761-007-08110.858 ppm
2014-03-113761-023-07550.542 ppm
2014-03-113761-044-0820ND
2014-03-113761-044-09000.745 ppm
2014-03-113761-044-0920ND
2014-03-113761-050-08000.926 ppm
2014-03-183761-018-08303.61 ppm
2014-04-103761-015-08100.610 ppm
2014-04-103761-023-08000.497 ppm
2014-04-103761-050-0810ND
2014-05-083761-042-10301.11 ppm
2014-05-133761-006-0820ND
2014-05-133761-015-08000.723 ppm
2014-05-133761-023-0755ND
2014-05-133761-050-07500.474 ppm
2014-06-103761-015-08401.06 ppm
2014-06-103761-023-0810ND
2014-06-103761-050-08300.474 ppm
2014-07-083761-007-08000.881 ppm
2014-07-103761-012-09241.47 ppm
2014-07-103761-018-09053.39 ppm
2014-07-103761-020-09400.813 ppm
2014-07-103761-053-09501.13 ppm
2014-07-103761-054-09371.47 ppm
2014-08-123761-007-08141.04 ppm
2014-09-113761-007-08400.994 ppm
2014-10-143761-001-0803ND
2015-02-053761-001-1010ND
2015-03-103761-015-08480.768 ppm
2015-03-103761-050-08320.633 ppm
2015-04-143761-015-08400.723 ppm
2015-04-143761-050-08300.587 ppm
2015-05-123761-015-08171.11 ppm
2015-05-123761-050-08050.678 ppm
2015-06-043761-020-08450.858 ppm
2015-06-093761-015-08071.04 ppm
2015-06-093761-050-08000.565 ppm
2015-07-093761-009-09071.94 ppm
2015-07-093761-018-08282.10 ppm
2015-07-093761-042-09151.20 ppm
2015-07-093761-044-0955ND
2015-07-093761-053-08451.15 ppm
2015-07-093761-054-08551.15 ppm
2015-07-163761-012-08401.22 ppm
2015-07-163761-015-08181.04 ppm
2015-07-163761-040-09100.926 ppm
2015-07-163761-050-0825ND
2015-08-113761-007-08100.971 ppm
2015-09-033761-016-0845ND
2015-09-103761-007-08150.971 ppm
2015-09-293761-006-0920ND
2015-10-133761-007-08100.994 ppm
2015-11-123761-006-0937ND
2015-11-123761-016-0946ND
2015-11-123761-018-09561.97 ppm
2015-11-123761-054-10051.29 ppm
2015-12-103761-006-0828ND
2015-12-103761-006-0828ND
2015-12-103761-016-0838ND
2015-12-103761-016-0838ND
2016-01-123761-006-08550.620 ppm
2016-01-123761-016-0916ND
2016-01-123761-053-09230.910 ppm
2016-01-123761-054-09321.30 ppm
2016-02-093761-006-09551.10 ppm
2016-02-093761-015-08481.20 ppm
2016-02-093761-016-0944ND
2016-02-093761-023-08171.10 ppm
2016-02-093761-050-08280.410 ppm
2016-02-113761-023-08401.10 ppm
2016-02-113761-044-1012ND
2016-03-083761-006-09550.700 ppm
2016-03-083761-015-08590.910 ppm
2016-03-083761-016-1004ND
2016-03-083761-023-08330.850 ppm
2016-03-083761-050-0845ND
2016-04-143761-015-08330.880 ppm
2016-04-143761-016-09210.670 ppm
2016-04-143761-018-09323.70 ppm
2016-04-143761-023-08160.640 ppm
2016-04-143761-050-0820ND
2016-04-283761-001-1010ND
2016-04-283761-015-09200.880 ppm
2016-04-283761-042-09501.20 ppm
2016-04-283761-050-0910ND
2016-05-033761-006-09150.770 ppm
2016-05-123761-015-08260.710 ppm
2016-05-123761-016-09200.780 ppm
2016-05-123761-018-08501.70 ppm
2016-05-123761-023-08070.470 ppm
2016-05-123761-050-0814ND
2016-06-163761-006-08400.660 ppm
2016-06-163761-015-08260.760 ppm
2016-06-163761-016-09100.670 ppm
2016-06-163761-018-08500.950 ppm
2016-06-163761-023-0809ND
2016-06-163761-050-08160.580 ppm
2016-07-053761-007-10300.750 ppm
2016-07-053761-012-08201.10 ppm
2016-07-053761-018-08400.970 ppm
2016-07-143761-006-08390.690 ppm
2016-07-143761-015-09000.910 ppm
2016-07-143761-016-08490.570 ppm
2016-07-143761-018-08591.10 ppm
2016-07-143761-023-0837ND
2016-07-143761-050-08460.500 ppm
2016-07-283761-009-07501.70 ppm
2016-07-283761-040-08050.980 ppm
2016-07-283761-053-08250.910 ppm
2016-07-283761-054-08451.30 ppm
2016-08-113761-006-09570.760 ppm
2016-08-113761-015-09501.10 ppm
2016-08-113761-016-09230.500 ppm
2016-08-113761-018-09301.40 ppm
2016-08-113761-050-09400.540 ppm
2016-08-113761-054-09131.20 ppm
2016-09-153761-006-09210.810 ppm
2016-09-153761-015-08321.20 ppm
2016-09-153761-016-09300.410 ppm
2016-09-153761-018-09431.40 ppm
2016-09-153761-050-0818ND
2016-09-153761-054-09551.10 ppm
2016-10-133761-006-09580.810 ppm
2016-10-133761-007-08011.20 ppm
2016-10-133761-016-1005ND
2016-10-133761-018-10201.60 ppm
2016-10-133761-050-0750ND
2016-11-103761-006-08301.10 ppm
2016-11-103761-007-08201.20 ppm
2016-12-133761-006-08391.20 ppm
2016-12-133761-007-08201.000 ppm
2016-12-133761-018-08501.40 ppm
2017-01-173761-006-08403.00 ppm
2017-01-173761-007-09301.40 ppm
2017-01-173761-050-09201.20 ppm
2017-02-143761-007-08101.80 ppm
2017-02-143761-050-07500.560 ppm
2017-03-143761-006-09284.00 ppm
2017-03-143761-015-08333.40 ppm
2017-03-143761-018-09382.80 ppm
2017-03-143761-023-08201.90 ppm
2017-03-143761-050-08270.470 ppm
2017-04-113761-006-08243.70 ppm
2017-04-113761-015-07532.60 ppm
2017-04-113761-018-08412.30 ppm
2017-04-113761-023-07291.30 ppm
2017-04-113761-050-07390.570 ppm
2017-05-093761-006-09453.20 ppm
2017-05-093761-015-09162.00 ppm
2017-05-093761-018-09552.10 ppm
2017-05-093761-023-09000.660 ppm
2017-05-093761-050-0910ND
2017-05-163761-042-10051.40 ppm
2017-05-183761-044-08550.630 ppm
2017-05-233761-020-09500.560 ppm
2017-07-113761-001-1000ND
2017-07-113761-015-07451.60 ppm
2017-07-113761-020-09300.600 ppm
2017-07-113761-023-07350.570 ppm
2017-07-113761-050-08300.670 ppm
2017-07-113761-053-08451.10 ppm
2017-07-113761-054-08551.20 ppm
2017-07-253761-009-09301.20 ppm
2017-07-253761-040-09400.910 ppm
2017-08-033761-012-09000.700 ppm
2017-08-083761-006-09101.90 ppm
2017-08-083761-015-08001.60 ppm
2017-08-083761-016-09150.770 ppm
2017-08-083761-018-09251.80 ppm
2017-08-083761-023-07501.90 ppm
2017-08-083761-050-07451.20 ppm
2017-09-123761-006-08001.70 ppm
2017-09-123761-015-07402.00 ppm
2017-09-123761-016-08050.710 ppm
2017-09-123761-018-08102.20 ppm
2017-09-123761-023-07302.10 ppm
2017-09-123761-050-07200.940 ppm
2017-10-103761-006-08001.70 ppm
2017-10-103761-015-07402.60 ppm
2017-10-103761-016-08100.690 ppm
2017-10-103761-018-08153.60 ppm
2017-10-103761-023-07301.80 ppm
2017-10-103761-040-08300.720 ppm
2017-10-103761-050-07251.30 ppm
2017-11-143761-020-09450.570 ppm
2017-11-143761-040-09101.10 ppm
2017-11-143761-053-08501.60 ppm
2017-12-123761-007-08162.40 ppm
2017-12-123761-050-08051.10 ppm
2018-01-093761-006-07480.910 ppm
2018-01-093761-018-07454.60 ppm
2018-03-133761-015-08202.40 ppm
2018-03-133761-023-08300.950 ppm
2018-04-103761-015-08102.70 ppm
2018-04-103761-023-08050.900 ppm
2018-05-153761-015-08062.90 ppm
2018-05-153761-023-07570.650 ppm
2018-05-223761-001-1025ND
2018-05-223761-042-10081.80 ppm
2018-05-223761-044-0900ND
2018-06-073761-020-10150.640 ppm
2018-06-123761-015-08252.80 ppm
2018-06-123761-023-08200.530 ppm
2018-07-193761-009-09251.30 ppm
2018-07-193761-012-09200.820 ppm
2018-07-193761-016-08350.830 ppm
2018-07-193761-018-08401.50 ppm
2018-07-193761-040-09151.10 ppm
2018-07-193761-053-07551.70 ppm
2018-07-193761-054-08001.30 ppm
2018-08-163761-015-10052.90 ppm
2018-08-163761-023-09500.840 ppm
2018-08-163761-050-09560.780 ppm
2018-09-113761-007-07503.20 ppm
2018-09-113761-023-07451.000 ppm
2018-09-113761-050-07400.890 ppm
2018-09-133761-016-08501.10 ppm
2019-02-123761-015-08252.10 ppm
2019-02-123761-023-08150.940 ppm
2019-02-123761-023-09000.940 ppm
2019-02-143761-044-09480.560 ppm
2019-03-123761-006-08282.60 ppm
2019-03-123761-015-09303.00 ppm
2019-03-123761-023-09121.10 ppm
2019-04-113761-007-08102.40 ppm
2019-04-113761-023-08000.990 ppm
2019-04-163761-001-0900ND
2019-04-163761-015-08452.60 ppm
2019-05-093761-006-08352.40 ppm
2019-05-143761-015-08102.30 ppm
2019-05-143761-023-07550.710 ppm
2019-05-143761-050-0805ND
2019-05-163761-050-0755ND
2019-06-113761-015-08302.40 ppm
2019-06-113761-016-08001.30 ppm
2019-06-113761-023-08250.510 ppm
2019-07-093761-015-07322.30 ppm
2019-07-093761-023-07250.670 ppm
2019-07-093761-050-0730ND
2019-07-183761-007-09501.40 ppm
2019-07-183761-009-08352.30 ppm
2019-07-183761-012-10181.000 ppm
2019-07-183761-018-10102.00 ppm
2019-07-183761-040-09401.40 ppm
2019-07-183761-053-09052.00 ppm
2019-07-183761-054-09301.30 ppm
2019-08-133761-015-07582.20 ppm
2019-08-133761-023-07451.000 ppm
2019-08-133761-050-07521.10 ppm
2019-09-123761-015-08102.50 ppm
2019-09-123761-016-08300.860 ppm
2019-09-123761-023-08201.10 ppm
2019-09-123761-050-08250.850 ppm
2019-10-103761-015-08123.20 ppm
2019-10-103761-023-07581.20 ppm
2019-11-143761-007-07502.80 ppm
2019-12-103761-015-08352.20 ppm