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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

City of Rohnert Park

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

 

186

Samples

0

Samples exceeding legal limit (MCL)

149

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.99 ppm3429ND - 8.36 ppm
20152.18 ppm3027ND - 7.00 ppm
20162.44 ppm3229ND - 7.60 ppm
20172.72 ppm2920ND - 7.90 ppm
20183.26 ppm3124ND - 8.40 ppm
20192.86 ppm3023ND - 9.60 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
2014-01-219541-034-11158.36 ppm
2014-01-219541-040-10188.13 ppm
2014-02-259541-034-11306.10 ppm
2014-02-259541-040-10507.00 ppm
2014-08-059541-001-11302.08 ppm
2014-08-059541-004-11352.71 ppm
2014-08-059541-007-12154.07 ppm
2014-08-059541-008-12051.90 ppm
2014-08-059541-009-11453.39 ppm
2014-08-059541-010-11101.24 ppm
2014-08-059541-018-1045ND
2014-08-059541-020-10200.655 ppm
2014-08-059541-022-10051.20 ppm
2014-08-059541-029-10100.497 ppm
2014-08-059541-030-11000.339 ppm
2014-08-059541-034-09458.36 ppm
2014-08-059541-035-0930ND
2014-08-059541-040-09555.65 ppm
2014-08-129541-002-1120ND
2014-08-129541-005-10502.94 ppm
2014-08-129541-012-10150.294 ppm
2014-08-129541-039-11054.52 ppm
2014-08-199541-011-11000.678 ppm
2014-08-199541-014-09450.248 ppm
2014-08-199541-016-08400.452 ppm
2014-08-199541-021-10000.791 ppm
2014-08-199541-033-10154.97 ppm
2014-08-199541-034-10406.78 ppm
2014-08-199541-040-10505.20 ppm
2014-09-029541-027-09000.565 ppm
2014-10-289541-041-0915ND
2014-10-289541-044-0945ND
2014-11-189541-034-10557.23 ppm
2014-11-189541-040-10405.42 ppm
2015-03-109541-034-10157.00 ppm
2015-03-109541-040-08104.52 ppm
2015-05-059541-034-08406.10 ppm
2015-05-059541-040-08155.20 ppm
2015-08-119541-001-07401.81 ppm
2015-08-119541-002-07550.497 ppm
2015-08-119541-009-09302.94 ppm
2015-08-119541-012-12500.248 ppm
2015-08-119541-016-08151.69 ppm
2015-08-119541-022-09551.69 ppm
2015-08-119541-029-09501.49 ppm
2015-08-119541-033-09003.84 ppm
2015-08-119541-035-0910ND
2015-08-119541-039-09204.29 ppm
2015-08-189541-004-10002.10 ppm
2015-08-189541-005-11002.71 ppm
2015-08-189541-007-10553.39 ppm
2015-08-189541-008-10262.01 ppm
2015-08-189541-010-08501.11 ppm
2015-08-189541-011-08450.610 ppm
2015-08-189541-014-09000.226 ppm
2015-08-189541-018-0930ND
2015-08-189541-020-09150.497 ppm
2015-08-189541-030-08300.271 ppm
2015-09-299541-027-10500.565 ppm
2015-12-019541-041-1245ND
2015-12-229541-034-09405.65 ppm
2015-12-229541-040-09114.29 ppm
2015-12-299541-021-09510.429 ppm
2015-12-299541-031-10370.131 ppm
2016-03-089541-034-09305.80 ppm
2016-03-089541-040-09407.60 ppm
2016-06-079541-034-08105.30 ppm
2016-06-079541-040-08004.60 ppm
2016-09-069541-018-0907ND
2016-09-069541-021-09100.770 ppm
2016-09-069541-022-09501.000 ppm
2016-09-069541-027-08500.540 ppm
2016-09-069541-034-09456.50 ppm
2016-09-069541-035-1006ND
2016-09-139541-033-09414.20 ppm
2016-09-209541-001-09001.90 ppm
2016-09-209541-002-09150.460 ppm
2016-09-209541-005-10263.10 ppm
2016-09-209541-007-10403.80 ppm
2016-09-209541-009-10573.30 ppm
2016-09-209541-011-08150.610 ppm
2016-09-209541-012-09050.270 ppm
2016-09-209541-014-08300.260 ppm
2016-09-209541-040-09456.20 ppm
2016-09-209541-041-1146ND
2016-09-279541-004-08202.30 ppm
2016-09-279541-008-09501.10 ppm
2016-09-279541-010-08301.10 ppm
2016-09-279541-016-09000.410 ppm
2016-09-279541-029-08450.560 ppm
2016-09-279541-030-08500.110 ppm
2016-09-279541-031-10280.210 ppm
2016-09-279541-039-10194.80 ppm
2016-09-279541-044-10400.120 ppm
2016-12-069541-034-08306.10 ppm
2016-12-069541-040-08305.20 ppm
2017-03-149541-034-09206.30 ppm
2017-03-149541-040-10355.00 ppm
2017-06-131610-034-09007.40 ppm
2017-06-131610-040-08505.70 ppm
2017-07-181610-005-08302.60 ppm
2017-07-181610-008-10001.40 ppm
2017-07-181610-009-10303.00 ppm
2017-07-181610-010-08550.840 ppm
2017-07-181610-011-08310.510 ppm
2017-07-181610-014-0920ND
2017-07-181610-016-0800ND
2017-07-181610-034-08007.60 ppm
2017-07-181610-040-08207.90 ppm
2017-07-181610-041-1100ND
2017-07-251610-001-08062.00 ppm
2017-07-251610-004-08202.40 ppm
2017-07-251610-012-0840ND
2017-07-251610-021-09200.810 ppm
2017-07-251610-022-08351.10 ppm
2017-07-251610-029-09151.60 ppm
2017-07-251610-030-0930ND
2017-07-251610-031-1030ND
2017-07-251610-035-0905ND
2017-07-251610-039-08534.80 ppm
2017-08-011610-044-0905ND
2017-08-151610-018-1015ND
2017-08-151610-033-10304.10 ppm
2017-10-241610-034-07506.30 ppm
2017-10-241610-040-08007.40 ppm
2018-01-231610-034-09498.00 ppm
2018-01-231610-040-09336.30 ppm
2018-04-171610-034-08227.70 ppm
2018-04-171610-040-08178.00 ppm
2018-05-011610-034-08208.20 ppm
2018-05-151610-002-09180.480 ppm
2018-07-101610-034-09308.40 ppm
2018-07-101610-040-09205.80 ppm
2018-08-071610-001-09221.30 ppm
2018-08-071610-002-08100.490 ppm
2018-08-071610-004-09302.30 ppm
2018-08-071610-005-09452.80 ppm
2018-08-071610-018-1030ND
2018-08-071610-029-10451.50 ppm
2018-08-071610-030-0900ND
2018-08-071610-031-1000ND
2018-08-071610-039-08254.40 ppm
2018-08-071610-040-08355.70 ppm
2018-08-141610-009-08303.10 ppm
2018-08-141610-010-10300.910 ppm
2018-08-141610-014-1043ND
2018-08-141610-016-08200.550 ppm
2018-08-141610-021-09470.640 ppm
2018-08-141610-033-08403.80 ppm
2018-08-141610-034-08566.80 ppm
2018-08-141610-035-0848ND
2018-08-141610-044-1052ND
2018-10-231610-034-09107.20 ppm
2018-10-231610-040-09216.10 ppm
2018-11-061610-006-0900ND
2018-11-061610-011-09200.640 ppm
2019-01-241610-034-08276.60 ppm
2019-01-241610-040-08246.00 ppm
2019-03-051610-013-10304.20 ppm
2019-04-161610-034-09199.60 ppm
2019-04-161610-040-09306.10 ppm
2019-07-231610-001-08001.80 ppm
2019-07-231610-002-08520.460 ppm
2019-07-231610-004-08442.20 ppm
2019-07-231610-005-09402.70 ppm
2019-07-231610-006-0825ND
2019-07-231610-011-09000.610 ppm
2019-07-231610-013-09224.10 ppm
2019-07-231610-021-09300.790 ppm
2019-07-231610-030-0905ND
2019-07-231610-031-0920ND
2019-07-231610-039-10255.20 ppm
2019-07-231610-040-09367.30 ppm
2019-07-231610-044-0845ND
2019-09-101610-004-09143.20 ppm
2019-09-101610-006-08200.580 ppm
2019-09-101610-009-09213.40 ppm
2019-09-101610-014-0945ND
2019-09-101610-016-09200.470 ppm
2019-09-101610-018-0835ND
2019-09-101610-021-09051.10 ppm
2019-09-101610-029-08550.440 ppm
2019-09-101610-033-08354.00 ppm
2019-09-101610-034-09378.10 ppm
2019-09-101610-035-0950ND
2019-10-081610-034-09336.80 ppm