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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

Zone 7 Water Agency

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.

 

261

Samples

0

Samples exceeding legal limit (MCL)

177

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.62 ppm3926ND - 5.04 ppm
20151.33 ppm2914ND - 5.00 ppm
20162.08 ppm4633ND - 5.79 ppm
20171.71 ppm4226ND - 4.86 ppm
20182.13 ppm4937ND - 4.96 ppm
20191.95 ppm5641ND - 5.10 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
2014-01-065100-001-09450.723 ppm
2014-01-065100-006-11203.82 ppm
2014-01-065100-008-09150.700 ppm
2014-01-065100-012-12404.70 ppm
2014-02-035100-001-10251.15 ppm
2014-02-185100-008-09500.881 ppm
2014-03-245100-001-10000.971 ppm
2014-03-245100-008-10451.04 ppm
2014-04-075100-001-09400.723 ppm
2014-04-075100-008-11200.723 ppm
2014-05-055100-001-0930ND
2014-05-055100-008-1035ND
2014-06-095100-001-1000ND
2014-06-095100-008-1035ND
2014-06-105100-005-10002.98 ppm
2014-06-105100-011-10403.23 ppm
2014-06-115100-006-08253.68 ppm
2014-06-115100-013-09303.75 ppm
2014-06-165100-007-09102.10 ppm
2014-06-175100-012-11255.04 ppm
2014-06-195100-019-09354.29 ppm
2014-07-075100-001-1000ND
2014-07-075100-008-1015ND
2014-08-045100-001-0950ND
2014-08-045100-008-1035ND
2014-08-115100-005-09203.00 ppm
2014-08-115100-011-09403.32 ppm
2014-09-085100-001-0840ND
2014-09-085100-006-11502.58 ppm
2014-09-095100-007-09302.39 ppm
2014-09-105100-005-08303.09 ppm
2014-09-105100-011-08003.30 ppm
2014-10-065100-001-1110ND
2014-10-065100-008-0825ND
2014-11-035100-001-0935ND
2014-11-035100-008-0930ND
2014-11-135100-017-09053.93 ppm
2014-12-085100-001-09050.610 ppm
2014-12-085100-008-10450.565 ppm
2015-01-055100-001-09351.49 ppm
2015-01-055100-008-09451.47 ppm
2015-02-025100-008-09550.904 ppm
2015-03-025100-001-10050.904 ppm
2015-03-035100-017-08254.29 ppm
2015-03-245100-019-10054.07 ppm
2015-04-135100-001-08500.452 ppm
2015-04-135100-008-08400.452 ppm
2015-05-045100-001-0945ND
2015-05-045100-008-1025ND
2015-06-225100-001-1100ND
2015-06-225100-008-0845ND
2015-06-245100-019-08454.47 ppm
2015-06-255100-017-09554.88 ppm
2015-06-265100-005-09053.05 ppm
2015-06-265100-007-09302.67 ppm
2015-07-065100-001-0855ND
2015-07-065100-008-1036ND
2015-08-035100-001-0920ND
2015-08-035100-008-1010ND
2015-09-085100-001-0930ND
2015-09-085100-008-1030ND
2015-09-105100-017-09105.00 ppm
2015-10-055100-001-0950ND
2015-10-055100-008-0920ND
2015-11-025100-001-0927ND
2015-11-025100-008-0925ND
2015-11-235100-017-11104.46 ppm
2015-12-075100-001-0930ND
2016-01-045100-001-09300.580 ppm
2016-02-035100-012-10504.76 ppm
2016-02-095100-005-08552.96 ppm
2016-02-095100-011-08423.89 ppm
2016-03-035100-006-11002.01 ppm
2016-03-035100-017-09354.93 ppm
2016-03-075100-001-09250.790 ppm
2016-03-295100-007-12452.13 ppm
2016-03-305100-020-10302.05 ppm
2016-04-045100-005-10442.89 ppm
2016-04-045100-008-09050.800 ppm
2016-04-045100-013-14254.33 ppm
2016-04-045100-019-11353.59 ppm
2016-04-065100-012-11054.92 ppm
2016-04-065100-020-11553.08 ppm
2016-05-025100-019-12253.91 ppm
2016-05-045100-001-08250.480 ppm
2016-05-045100-008-12000.490 ppm
2016-05-195100-007-09002.10 ppm
2016-05-195100-017-09454.72 ppm
2016-05-195100-020-10581.33 ppm
2016-06-025100-005-08202.92 ppm
2016-06-065100-001-0935ND
2016-06-065100-008-1025ND
2016-07-115100-001-0920ND
2016-07-115100-007-12202.37 ppm
2016-07-115100-008-1010ND
2016-07-115100-020-13171.65 ppm
2016-07-135100-017-10355.75 ppm
2016-07-135100-019-09203.61 ppm
2016-08-015100-001-1005ND
2016-08-015100-008-0955ND
2016-08-015100-020-13401.45 ppm
2016-08-105100-005-12502.62 ppm
2016-09-125100-001-0955ND
2016-09-125100-008-1025ND
2016-09-195100-007-11302.26 ppm
2016-09-195100-017-12075.79 ppm
2016-10-105100-001-0915ND
2016-10-105100-008-0930ND
2016-10-135100-012-14005.08 ppm
2016-11-075100-001-1117ND
2016-11-075100-008-1115ND
2016-11-145100-017-10455.10 ppm
2016-12-055100-001-0900ND
2016-12-055100-008-09250.480 ppm
2017-01-045100-013-10003.82 ppm
2017-01-045100-017-09454.51 ppm
2017-01-235100-008-0930ND
2017-01-235100-012-10304.86 ppm
2017-01-235100-020-11252.58 ppm
2017-02-145100-008-10230.960 ppm
2017-02-145100-020-14551.81 ppm
2017-02-155100-001-10450.940 ppm
2017-03-135100-001-0900ND
2017-04-105100-001-0910ND
2017-04-125100-017-11104.13 ppm
2017-05-015100-001-0930ND
2017-05-015100-008-1128ND
2017-06-055100-001-0910ND
2017-06-055100-006-14102.04 ppm
2017-06-055100-007-14202.62 ppm
2017-06-055100-008-1004ND
2017-07-105100-007-10101.93 ppm
2017-07-105100-019-11353.75 ppm
2017-07-115100-001-0935ND
2017-07-115100-008-0955ND
2017-07-115100-017-12103.94 ppm
2017-07-125100-012-09004.34 ppm
2017-07-135100-013-09153.63 ppm
2017-07-315100-020-10401.64 ppm
2017-08-095100-001-1015ND
2017-08-095100-008-1035ND
2017-09-055100-001-0900ND
2017-09-055100-008-0947ND
2017-09-255100-005-10102.92 ppm
2017-10-025100-001-0915ND
2017-10-025100-008-1010ND
2017-10-035100-005-10553.00 ppm
2017-10-035100-013-10253.98 ppm
2017-10-035100-017-09504.01 ppm
2017-10-055100-006-09353.11 ppm
2017-10-055100-007-10152.15 ppm
2017-10-165100-019-12553.72 ppm
2017-11-065100-001-0915ND
2017-11-065100-008-10500.400 ppm
2017-12-045100-001-09000.550 ppm
2017-12-045100-008-09450.570 ppm
2018-01-225100-001-09460.900 ppm
2018-01-255100-005-13353.06 ppm
2018-02-055100-012-09053.94 ppm
2018-02-055100-013-08504.23 ppm
2018-02-055100-017-09504.00 ppm
2018-02-065100-001-09580.830 ppm
2018-02-065100-005-09123.02 ppm
2018-02-065100-011-08554.96 ppm
2018-02-285100-006-09452.82 ppm
2018-02-285100-008-11000.610 ppm
2018-04-095100-001-11370.400 ppm
2018-04-095100-008-10200.480 ppm
2018-04-095100-017-10353.83 ppm
2018-04-105100-005-12403.21 ppm
2018-04-105100-011-12154.52 ppm
2018-04-105100-019-09253.59 ppm
2018-04-115100-006-10103.10 ppm
2018-04-115100-012-10403.59 ppm
2018-04-115100-013-09404.20 ppm
2018-05-075100-001-1515ND
2018-05-075100-008-1330ND
2018-06-045100-001-0920ND
2018-06-045100-008-1010ND
2018-07-095100-001-1225ND
2018-07-095100-005-13503.16 ppm
2018-07-095100-008-0925ND
2018-07-095100-013-09304.23 ppm
2018-07-095100-017-11204.07 ppm
2018-07-095100-019-10003.42 ppm
2018-07-115100-006-09353.15 ppm
2018-07-115100-011-09004.40 ppm
2018-08-065100-001-0935ND
2018-08-065100-008-0925ND
2018-08-075100-007-08452.28 ppm
2018-09-105100-001-0830ND
2018-09-105100-008-0840ND
2018-09-255100-020-13140.990 ppm
2018-10-085100-001-0825ND
2018-10-085100-008-0959ND
2018-10-085100-012-12002.32 ppm
2018-10-085100-019-11403.72 ppm
2018-10-095100-017-09003.81 ppm
2018-10-105100-007-14352.25 ppm
2018-10-105100-020-14151.47 ppm
2018-12-035100-008-10100.540 ppm
2018-12-035100-020-10051.50 ppm
2018-12-045100-013-09203.75 ppm
2018-12-045100-019-10003.52 ppm
2018-12-175100-001-09230.710 ppm
2019-01-075100-005-12152.93 ppm
2019-01-075100-008-10170.740 ppm
2019-01-075100-012-11002.11 ppm
2019-01-075100-017-10253.91 ppm
2019-01-075100-020-11500.800 ppm
2019-01-085100-007-09102.03 ppm
2019-01-085100-011-10154.67 ppm
2019-01-085100-019-09405.10 ppm
2019-02-045100-008-10281.28 ppm
2019-03-045100-008-09070.860 ppm
2019-04-085100-007-11301.96 ppm
2019-04-085100-008-0925ND
2019-04-085100-017-09164.65 ppm
2019-04-095100-006-09202.57 ppm
2019-04-095100-012-09351.53 ppm
2019-04-095100-013-09553.14 ppm
2019-04-095100-019-10403.31 ppm
2019-05-065100-001-0850ND
2019-05-065100-008-1215ND
2019-06-035100-001-0940ND
2019-06-035100-008-0910ND
2019-07-085100-005-10153.03 ppm
2019-07-085100-007-09501.75 ppm
2019-07-085100-011-09454.32 ppm
2019-07-085100-013-10153.01 ppm
2019-07-085100-020-11301.86 ppm
2019-07-095100-006-11452.22 ppm
2019-07-095100-017-09253.70 ppm
2019-07-095100-019-10453.59 ppm
2019-07-105100-001-1010ND
2019-07-105100-008-1115ND
2019-08-055100-001-1105ND
2019-08-055100-008-0915ND
2019-08-055100-012-09051.47 ppm
2019-08-055100-020-09350.900 ppm
2019-09-095100-001-0840ND
2019-09-095100-008-1005ND
2019-10-075100-001-1325ND
2019-10-075100-005-11503.07 ppm
2019-10-075100-006-09001.87 ppm
2019-10-075100-007-08301.52 ppm
2019-10-075100-008-1210ND
2019-10-075100-011-10504.66 ppm
2019-10-075100-012-10151.41 ppm
2019-10-075100-013-09452.97 ppm
2019-10-075100-020-09201.08 ppm
2019-10-085100-017-08303.81 ppm
2019-10-085100-019-10153.52 ppm
2019-11-045100-001-0855ND
2019-11-045100-008-1030ND
2019-12-025100-008-10060.610 ppm
2019-12-025100-020-08501.19 ppm
2019-12-035100-017-11554.55 ppm
2019-12-035100-019-13404.18 ppm
2019-12-105100-017-11004.06 ppm
2019-12-105100-019-09423.16 ppm