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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

Irvine Ranch Water District

Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.

MORE ABOUT THIS CONTAMINANT

 

406

Samples

0

Samples exceeding legal limit (MCL)

284

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014N/A00N/A
2015N/A00N/A
20162.32 ppm8965ND - 6.06 ppm
20171.98 ppm11987ND - 4.90 ppm
20182.01 ppm9970ND - 9.80 ppm
20191.73 ppm9962ND - 5.50 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.

EPA Maximum Contaminant
Level (MCL) 10 ppm

ppm = parts per million

All test results

Date Lab ID Result
2016-01-044317-060-13590.550 ppm
2016-01-064317-075-10434.20 ppm
2016-01-124417-006-0910ND
2016-01-124417-017-0940ND
2016-01-124417-077-10302.78 ppm
2016-01-134317-075-09084.60 ppm
2016-01-184317-075-13104.60 ppm
2016-01-254317-075-13504.30 ppm
2016-01-284417-011-0845ND
2016-01-284417-016-0820ND
2016-01-284417-056-10001.55 ppm
2016-01-284417-058-10250.770 ppm
2016-01-284417-072-09250.730 ppm
2016-02-014317-075-14254.10 ppm
2016-02-084417-009-0750ND
2016-02-084317-075-13194.10 ppm
2016-02-184417-005-0825ND
2016-02-184317-075-10334.00 ppm
2016-02-224317-075-13004.10 ppm
2016-02-234417-003-0815ND
2016-02-234417-004-0835ND
2016-02-234417-020-0755ND
2016-02-294417-019-0955ND
2016-03-014317-075-13454.30 ppm
2016-03-074417-007-11100.750 ppm
2016-03-074317-075-12374.00 ppm
2016-03-144317-075-12364.00 ppm
2016-03-174417-014-1025ND
2016-03-214317-075-12353.80 ppm
2016-03-244317-063-1030ND
2016-03-284317-075-12453.90 ppm
2016-04-044317-075-12044.00 ppm
2016-04-114317-060-12230.590 ppm
2016-04-114317-075-12354.00 ppm
2016-04-254317-075-12173.60 ppm
2016-05-024317-075-13373.10 ppm
2016-05-094317-075-13002.80 ppm
2016-05-114317-069-0850ND
2016-05-184317-063-0940ND
2016-05-234317-075-09102.80 ppm
2016-05-314417-023-0905ND
2016-05-314417-024-0835ND
2016-05-314317-075-08232.90 ppm
2016-06-024417-007-07500.590 ppm
2016-06-074317-075-12572.90 ppm
2016-06-084417-020-0740ND
2016-06-134317-075-12503.00 ppm
2016-06-204317-075-13053.10 ppm
2016-06-234417-008-0835ND
2016-06-274317-075-13103.00 ppm
2016-06-274417-077-08206.06 ppm
2016-07-064317-075-09364.20 ppm
2016-07-114317-060-08490.580 ppm
2016-07-114317-075-13304.10 ppm
2016-07-184317-075-13204.50 ppm
2016-07-264417-010-0900ND
2016-07-264317-075-09324.10 ppm
2016-07-284417-078-12000.910 ppm
2016-08-014317-075-13384.30 ppm
2016-08-024317-052-1230ND
2016-08-024317-060-09580.620 ppm
2016-08-094317-075-12384.30 ppm
2016-08-154417-024-1015ND
2016-08-154417-024-1025ND
2016-08-154317-075-13104.10 ppm
2016-08-174317-063-1325ND
2016-08-224317-075-14024.20 ppm
2016-08-314317-075-09224.00 ppm
2016-09-064317-075-09134.00 ppm
2016-09-124317-075-09014.20 ppm
2016-09-124417-077-09154.66 ppm
2016-09-124417-077-09254.64 ppm
2016-09-214317-075-14113.60 ppm
2016-09-264317-075-10423.40 ppm
2016-10-034317-075-12003.00 ppm
2016-10-044317-060-09230.520 ppm
2016-10-104317-075-12352.70 ppm
2016-10-124317-063-1012ND
2016-10-174317-075-12353.00 ppm
2016-10-244317-075-12302.90 ppm
2016-10-314317-075-11452.90 ppm
2016-11-074317-075-13303.00 ppm
2016-11-144317-075-13402.80 ppm
2016-11-214317-075-13412.80 ppm
2016-11-294317-075-14102.90 ppm
2016-12-054317-075-09152.90 ppm
2016-12-124317-075-14092.80 ppm
2016-12-194317-075-13452.90 ppm
2016-12-274317-075-13003.00 ppm
2017-01-034317-075-13463.00 ppm
2017-01-094417-017-0920ND
2017-01-114317-075-12112.80 ppm
2017-01-124317-060-12410.540 ppm
2017-01-174417-011-0835ND
2017-01-174417-016-0805ND
2017-01-174317-075-11322.90 ppm
2017-01-174417-077-10402.74 ppm
2017-01-194417-058-09400.830 ppm
2017-01-234417-003-0950ND
2017-01-234417-005-1055ND
2017-01-234417-006-08500.530 ppm
2017-01-234417-014-1015ND
2017-01-234417-019-1040ND
2017-01-254317-075-12132.80 ppm
2017-01-264417-007-08300.610 ppm
2017-02-034317-075-07104.30 ppm
2017-02-064317-075-09304.80 ppm
2017-02-134317-075-08414.70 ppm
2017-02-144417-004-0820ND
2017-02-144417-020-1340ND
2017-02-144417-078-10100.940 ppm
2017-02-214317-075-09554.70 ppm
2017-02-274317-075-09004.70 ppm
2017-02-284417-007-08400.500 ppm
2017-02-284317-085-13341.30 ppm
2017-03-014417-003-0735ND
2017-03-014417-003-0745ND
2017-03-014417-020-0755ND
2017-03-064317-075-12454.90 ppm
2017-03-074417-077-11202.88 ppm
2017-03-074417-077-11352.89 ppm
2017-03-134317-075-12354.30 ppm
2017-03-144417-007-10100.660 ppm
2017-03-144417-056-12102.57 ppm
2017-03-154417-077-10253.08 ppm
2017-03-154417-077-10403.08 ppm
2017-03-214317-063-1418ND
2017-03-214317-064-1437ND
2017-03-214317-075-10204.70 ppm
2017-03-274317-075-12344.80 ppm
2017-03-294317-069-1032ND
2017-03-304417-056-13402.96 ppm
2017-03-304417-056-13502.97 ppm
2017-04-034317-075-13454.10 ppm
2017-04-054317-060-09450.540 ppm
2017-04-104317-075-08004.60 ppm
2017-04-134417-006-08200.440 ppm
2017-04-174317-075-14004.50 ppm
2017-04-244317-075-13454.40 ppm
2017-04-264317-085-1040ND
2017-05-024417-008-1320ND
2017-05-024417-010-0910ND
2017-05-024417-023-0800ND
2017-05-024417-024-0850ND
2017-05-024317-075-12234.50 ppm
2017-05-084317-075-08364.60 ppm
2017-05-094417-007-08200.650 ppm
2017-05-154317-075-14094.80 ppm
2017-05-174417-020-1140ND
2017-05-234317-075-14004.80 ppm
2017-05-254417-056-10251.93 ppm
2017-05-254417-056-10401.92 ppm
2017-06-014417-058-11000.880 ppm
2017-06-014317-075-09504.60 ppm
2017-06-014417-078-10300.850 ppm
2017-06-064317-075-11104.20 ppm
2017-06-134317-075-13524.40 ppm
2017-06-194317-075-12404.20 ppm
2017-06-204317-063-0911ND
2017-06-264317-075-13003.50 ppm
2017-07-034317-060-13300.510 ppm
2017-07-034317-075-11073.40 ppm
2017-07-034317-076-13251.30 ppm
2017-07-054417-058-09400.890 ppm
2017-07-114317-052-1200ND
2017-07-114317-075-12503.40 ppm
2017-07-184317-075-12033.20 ppm
2017-07-244317-075-12403.10 ppm
2017-08-014417-018-0830ND
2017-08-014317-075-11072.80 ppm
2017-08-074317-075-12252.90 ppm
2017-08-094317-052-0825ND
2017-08-144317-075-13533.00 ppm
2017-08-214317-075-12503.20 ppm
2017-08-284317-075-12552.90 ppm
2017-09-054317-075-09423.00 ppm
2017-09-124417-072-11001.42 ppm
2017-09-134317-075-11182.80 ppm
2017-09-184317-075-09082.80 ppm
2017-09-214317-063-0840ND
2017-09-254317-075-10302.70 ppm
2017-09-254317-085-1124ND
2017-10-034317-075-12002.80 ppm
2017-10-044317-052-0745ND
2017-10-094317-060-14150.810 ppm
2017-10-094317-075-14302.80 ppm
2017-10-094317-076-14201.20 ppm
2017-10-164417-072-10251.29 ppm
2017-10-164417-072-10401.31 ppm
2017-10-164317-075-07252.60 ppm
2017-10-234317-075-08502.90 ppm
2017-10-304317-075-08222.70 ppm
2017-11-074317-052-1132ND
2017-11-074317-075-13162.80 ppm
2017-11-104317-085-0909ND
2017-11-144417-006-08100.450 ppm
2017-11-144417-015-09252.00 ppm
2017-11-144417-015-09352.02 ppm
2017-11-154317-075-10592.50 ppm
2017-11-204317-075-14562.80 ppm
2017-11-294317-075-12462.50 ppm
2017-12-044417-009-08201.25 ppm
2017-12-044317-075-12252.80 ppm
2017-12-064317-052-1300ND
2017-12-114317-075-13452.70 ppm
2017-12-124317-063-0943ND
2017-12-184317-075-14302.60 ppm
2017-12-264317-075-14212.80 ppm
2018-01-024317-075-13402.70 ppm
2018-01-034317-052-1020ND
2018-01-084317-075-13502.60 ppm
2018-01-094317-060-12550.580 ppm
2018-01-094317-076-13001.000 ppm
2018-01-154317-075-14022.90 ppm
2018-01-234317-075-08303.70 ppm
2018-01-294317-075-14452.50 ppm
2018-02-054317-075-13022.60 ppm
2018-02-064417-006-0800ND
2018-02-064417-017-0720ND
2018-02-064317-052-14080.400 ppm
2018-02-074417-011-0810ND
2018-02-074417-016-1000ND
2018-02-084417-005-0800ND
2018-02-084417-019-0840ND
2018-02-144317-075-12372.10 ppm
2018-02-144317-085-1413ND
2018-02-154417-014-0835ND
2018-02-204417-003-1220ND
2018-02-204417-009-08100.620 ppm
2018-02-204417-015-08452.00 ppm
2018-02-204417-056-10451.60 ppm
2018-02-204417-058-11150.950 ppm
2018-02-204417-072-10051.19 ppm
2018-02-224317-075-12002.30 ppm
2018-02-264317-075-12352.60 ppm
2018-02-274317-069-1110ND
2018-03-014417-077-10253.21 ppm
2018-03-064317-052-1045ND
2018-03-084317-075-11362.30 ppm
2018-03-124317-075-10132.40 ppm
2018-03-194317-075-09572.50 ppm
2018-03-204317-063-0820ND
2018-03-264317-075-13502.30 ppm
2018-04-024317-075-13242.40 ppm
2018-04-034317-052-11000.410 ppm
2018-04-034317-060-10000.600 ppm
2018-04-094417-006-0930ND
2018-04-094317-075-14152.50 ppm
2018-04-164317-075-13303.30 ppm
2018-04-174317-085-1141ND
2018-04-184417-007-09100.520 ppm
2018-04-234317-075-13102.60 ppm
2018-04-304417-023-0825ND
2018-04-304417-024-0810ND
2018-04-304317-075-13452.40 ppm
2018-04-304417-078-09250.880 ppm
2018-05-014317-052-1036ND
2018-05-104317-075-10135.10 ppm
2018-05-144317-075-10354.80 ppm
2018-05-214317-075-13504.60 ppm
2018-05-244417-008-0805ND
2018-05-304317-075-09454.20 ppm
2018-06-054317-075-13253.90 ppm
2018-06-064417-009-0830ND
2018-06-074317-052-0858ND
2018-06-114417-020-11100.420 ppm
2018-06-124317-075-13374.20 ppm
2018-06-184317-075-14099.80 ppm
2018-06-194417-018-0755ND
2018-06-254317-075-12344.00 ppm
2018-06-284317-063-1007ND
2018-07-024317-060-13020.630 ppm
2018-07-024317-076-13101.000 ppm
2018-07-034317-052-0852ND
2018-07-034317-075-10553.90 ppm
2018-07-104317-075-13034.50 ppm
2018-07-164317-075-08384.00 ppm
2018-07-234317-075-09003.70 ppm
2018-07-304317-075-10053.30 ppm
2018-08-074317-075-10104.00 ppm
2018-08-154317-075-13475.20 ppm
2018-08-214317-075-08453.90 ppm
2018-08-224317-063-1034ND
2018-08-274317-075-10324.70 ppm
2018-09-054317-075-10394.40 ppm
2018-09-104317-075-12525.00 ppm
2018-09-174317-075-13504.90 ppm
2018-09-254317-075-10424.50 ppm
2018-10-014317-075-08584.30 ppm
2018-10-024317-060-10300.680 ppm
2018-10-024317-076-10411.30 ppm
2018-10-094317-075-10224.60 ppm
2018-10-114417-006-1100ND
2018-10-154317-075-10182.80 ppm
2018-10-224317-075-10292.70 ppm
2018-10-234317-063-1123ND
2018-10-294317-075-09462.50 ppm
2018-11-054317-075-07372.40 ppm
2018-11-064317-052-1120ND
2018-11-134317-075-13352.40 ppm
2018-11-194317-075-13522.20 ppm
2018-11-274317-075-08402.10 ppm
2018-12-034317-075-13272.40 ppm
2018-12-044317-052-1119ND
2018-12-124317-075-09432.30 ppm
2018-12-194317-075-13155.10 ppm
2018-12-264317-075-10092.30 ppm
2019-01-024317-075-10342.30 ppm
2019-01-074417-006-0940ND
2019-01-074317-075-08532.60 ppm
2019-01-084317-052-1236ND
2019-01-094417-056-09351.67 ppm
2019-01-094417-078-09100.840 ppm
2019-01-144317-060-12580.580 ppm
2019-01-144317-075-09332.30 ppm
2019-01-214317-075-08252.30 ppm
2019-01-224417-003-1130ND
2019-01-224417-005-0915ND
2019-01-224417-009-0850ND
2019-01-224417-011-0830ND
2019-01-224417-014-0940ND
2019-01-224417-016-1010ND
2019-01-284317-075-12372.40 ppm
2019-02-054317-052-1207ND
2019-02-054317-075-10382.40 ppm
2019-02-064417-024-0920ND
2019-02-124317-075-11352.40 ppm
2019-02-194317-075-09302.30 ppm
2019-02-214417-007-11550.680 ppm
2019-02-214417-008-1220ND
2019-02-214417-015-11051.69 ppm
2019-02-214417-018-1130ND
2019-02-214417-020-1250ND
2019-02-214417-058-1015ND
2019-02-214417-072-10302.21 ppm
2019-02-214417-077-09402.86 ppm
2019-02-264317-075-11202.30 ppm
2019-02-274317-085-0941ND
2019-03-044317-075-11252.30 ppm
2019-03-064417-017-0835ND
2019-03-064317-052-1129ND
2019-03-114317-075-09232.20 ppm
2019-03-144317-063-09350.600 ppm
2019-03-144317-064-09430.620 ppm
2019-03-204317-075-13005.10 ppm
2019-03-264317-075-09505.30 ppm
2019-04-024317-052-1200ND
2019-04-024317-060-12320.550 ppm
2019-04-024317-063-11000.420 ppm
2019-04-024317-064-11090.420 ppm
2019-04-024317-075-13524.90 ppm
2019-04-024317-076-12391.20 ppm
2019-04-084317-075-13472.40 ppm
2019-04-154417-006-1025ND
2019-04-154417-017-1120ND
2019-04-154417-023-1310ND
2019-04-154417-024-1230ND
2019-04-154317-075-14012.30 ppm
2019-04-164417-008-0805ND
2019-04-224317-075-12542.40 ppm
2019-04-294317-075-14312.30 ppm
2019-05-014317-052-1313ND
2019-05-064317-075-09432.40 ppm
2019-05-134317-075-13352.40 ppm
2019-05-224317-075-12562.30 ppm
2019-05-284317-075-12202.40 ppm
2019-06-034317-075-10102.40 ppm
2019-06-044317-052-1217ND
2019-06-104317-075-09022.40 ppm
2019-06-174317-075-09502.40 ppm
2019-06-254317-075-13082.40 ppm
2019-06-274417-010-0745ND
2019-07-024317-060-10250.510 ppm
2019-07-024317-063-1110ND
2019-07-024317-064-1122ND
2019-07-024317-075-08272.50 ppm
2019-07-034317-052-0939ND
2019-07-094317-075-10075.50 ppm
2019-07-164317-075-10055.20 ppm
2019-07-174417-072-10401.46 ppm
2019-07-174417-072-10501.45 ppm
2019-07-174317-085-1413ND
2019-07-234317-075-12155.40 ppm
2019-07-314317-075-12125.40 ppm
2019-08-064317-052-1212ND
2019-08-064317-075-14225.40 ppm
2019-09-034317-075-09455.40 ppm
2019-09-044317-052-1335ND
2019-09-184417-004-1030ND
2019-10-034417-072-10501.51 ppm
2019-10-074417-006-1045ND
2019-10-074417-017-11300.400 ppm
2019-10-144317-060-10230.660 ppm
2019-10-224317-063-1037ND
2019-11-044317-075-10215.00 ppm
2019-11-044317-076-10141.40 ppm
2019-11-074317-052-1028ND
2019-11-124317-075-07535.10 ppm
2019-11-184317-075-09425.00 ppm
2019-11-254317-075-10455.00 ppm
2019-12-034317-075-09255.20 ppm
2019-12-044317-052-1035ND
2019-12-094317-075-12005.00 ppm
2019-12-174317-075-14214.70 ppm
2019-12-224317-075-07244.90 ppm
2019-12-314317-075-13254.80 ppm