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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

Rancho Estates 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

 

134

Samples

32

Samples exceeding legal limit (MCL)

123

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20146.66 ppm32324.83 ppm - 8.74 ppm
20155.59 ppm334.79 ppm - 7.12 ppm
201610.3 ppm15153.15 ppm - 15.0 ppm
20176.95 ppm2624ND - 16.6 ppm
20185.63 ppm4742ND - 14.0 ppm
20196.64 ppm118ND - 17.0 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
2014-01-301805-004-09006.33 ppm
2014-01-301805-007-09056.94 ppm
2014-01-301805-301-08506.12 ppm
2014-02-251805-004-08207.34 ppm
2014-02-251805-006-08306.64 ppm
2014-02-251805-007-08256.53 ppm
2014-02-251805-301-08507.14 ppm
2014-03-311805-004-10007.64 ppm
2014-03-311805-007-10057.95 ppm
2014-03-311805-301-10256.64 ppm
2014-04-291805-004-09354.83 ppm
2014-04-291805-006-09405.94 ppm
2014-04-291805-007-09354.83 ppm
2014-04-291805-301-10355.83 ppm
2014-05-291805-004-09006.53 ppm
2014-05-291805-006-09107.14 ppm
2014-05-291805-007-09058.74 ppm
2014-05-291805-301-09306.64 ppm
2014-06-301805-004-08057.43 ppm
2014-06-301805-006-08157.64 ppm
2014-06-301805-007-08106.84 ppm
2014-06-301805-301-08306.84 ppm
2014-07-071805-004-09105.83 ppm
2014-07-071805-006-08306.73 ppm
2014-07-071805-007-08456.23 ppm
2014-07-151805-004-08455.33 ppm
2014-07-151805-006-08557.14 ppm
2014-07-151805-007-08506.82 ppm
2014-08-281805-004-08256.03 ppm
2014-08-281805-006-08357.23 ppm
2014-08-281805-007-08306.94 ppm
2014-08-281805-301-09006.44 ppm
2015-07-301931-004-08107.12 ppm
2015-07-301931-006-08204.79 ppm
2015-07-301931-007-08154.88 ppm
2016-02-251931-004-130611.6 ppm
2016-02-251931-007-130514.0 ppm
2016-03-301931-004-08409.95 ppm
2016-03-301931-007-08458.48 ppm
2016-04-221931-004-08406.65 ppm
2016-04-221931-007-08459.25 ppm
2016-05-261931-004-090014.2 ppm
2016-05-261931-007-091012.7 ppm
2016-06-291931-004-09493.15 ppm
2016-07-201931-004-07265.35 ppm
2016-08-161931-004-07509.40 ppm
2016-09-141931-004-08379.73 ppm
2016-10-191931-004-074415.0 ppm
2016-11-161931-004-084314.3 ppm
2016-12-141931-004-071511.2 ppm
2017-01-181931-004-071513.8 ppm
2017-02-151931-004-083016.6 ppm
2017-03-151931-004-072013.9 ppm
2017-04-121931-004-074010.4 ppm
2017-04-121931-011-07100.0700 ppm
2017-05-171931-004-08308.68 ppm
2017-05-311931-004-07507.28 ppm
2017-06-141931-004-07557.42 ppm
2017-07-181931-004-07509.35 ppm
2017-07-181931-007-074510.6 ppm
2017-08-161931-004-08007.02 ppm
2017-08-161931-007-07527.85 ppm
2017-09-131931-004-08326.38 ppm
2017-09-131931-007-08257.62 ppm
2017-09-131931-010-08001.16 ppm
2017-09-131931-011-07500.400 ppm
2017-10-161931-004-09307.68 ppm
2017-10-161931-007-09278.25 ppm
2017-10-161931-010-09001.28 ppm
2017-10-161931-011-08300.420 ppm
2017-10-314790-002-1530ND
2017-11-011931-002-1346ND
2017-11-151931-004-07388.72 ppm
2017-11-151931-007-07357.64 ppm
2017-12-131931-004-080710.00 ppm
2017-12-131931-007-08008.20 ppm
2018-01-241931-007-13157.30 ppm
2018-02-204790-004-073513.0 ppm
2018-02-204790-007-07219.50 ppm
2018-02-204790-010-07401.10 ppm
2018-02-204790-011-07480.750 ppm
2018-03-134790-004-073514.0 ppm
2018-03-134790-007-073911.0 ppm
2018-03-134790-010-07171.10 ppm
2018-03-134790-011-07580.790 ppm
2018-04-104790-004-065812.0 ppm
2018-04-104790-007-06569.40 ppm
2018-04-104790-010-07092.00 ppm
2018-04-244790-010-07331.10 ppm
2018-05-084790-004-071512.0 ppm
2018-05-084790-007-07109.20 ppm
2018-05-084790-010-07201.20 ppm
2018-05-084790-011-06260.570 ppm
2018-06-054790-012-0700ND
2018-06-124790-004-080513.0 ppm
2018-06-124790-007-080010.00 ppm
2018-06-124790-010-07410.950 ppm
2018-06-124790-011-06510.410 ppm
2018-07-104790-004-073012.0 ppm
2018-07-104790-007-072511.0 ppm
2018-07-104790-010-07101.30 ppm
2018-07-104790-011-07000.710 ppm
2018-08-144790-004-073012.0 ppm
2018-08-144790-007-072512.0 ppm
2018-08-144790-010-07101.10 ppm
2018-08-144790-011-07000.480 ppm
2018-08-214790-012-0700ND
2018-09-114790-004-073013.0 ppm
2018-09-114790-007-072513.0 ppm
2018-09-114790-010-07101.20 ppm
2018-09-114790-011-07000.660 ppm
2018-09-114790-012-0745ND
2018-10-094790-004-073012.0 ppm
2018-10-094790-007-072513.0 ppm
2018-10-094790-010-07101.60 ppm
2018-10-094790-011-07001.90 ppm
2018-10-094790-012-07450.330 ppm
2018-11-064790-004-073012.0 ppm
2018-11-064790-007-072513.0 ppm
2018-11-064790-010-07101.30 ppm
2018-11-064790-011-07000.790 ppm
2018-11-064790-012-0745ND
2018-12-031931-002-0935ND
2019-01-154790-004-073012.0 ppm
2019-01-154790-007-072517.0 ppm
2019-01-154790-012-0745ND
2019-02-124790-004-073016.0 ppm
2019-02-124790-007-072516.0 ppm
2019-02-124790-010-07102.80 ppm
2019-02-124790-011-07001.10 ppm
2019-04-094790-010-07006.10 ppm
2019-04-094790-011-07102.00 ppm
2019-04-094790-012-0720ND
2019-12-301931-002-1358ND