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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

California American Water Company - Monterey

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

 

419

Samples

0

Samples exceeding legal limit (MCL)

264

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.19 ppm10149ND - 6.05 ppm
20151.19 ppm5019ND - 6.09 ppm
20161.72 ppm7551ND - 5.87 ppm
20171.79 ppm6963ND - 6.51 ppm
20181.81 ppm5852ND - 6.43 ppm
20191.34 ppm6660ND - 6.58 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
2014-01-085810-077-11552.94 ppm
2014-01-085810-083-12151.47 ppm
2014-01-131225-082-1040ND
2014-01-211225-089-11400.140 ppm
2014-01-221225-092-1145ND
2014-02-045810-029-13405.87 ppm
2014-02-045810-051-11002.26 ppm
2014-02-055810-077-10183.16 ppm
2014-02-051225-082-1111ND
2014-02-115810-002-1100ND
2014-02-115810-006-1030ND
2014-02-115810-020-1245ND
2014-02-115810-024-10551.83 ppm
2014-02-115810-052-1210ND
2014-02-115810-074-1040ND
2014-02-125810-046-1340ND
2014-02-121225-046-1355ND
2014-02-121225-047-1355ND
2014-02-125810-047-1355ND
2014-02-181225-017-1330ND
2014-02-185810-017-1335ND
2014-02-181225-044-1400ND
2014-02-185810-044-1400ND
2014-02-181225-045-1210ND
2014-02-185810-045-1210ND
2014-02-181225-054-1225ND
2014-02-185810-054-1225ND
2014-02-191225-033-1320ND
2014-02-195810-033-1320ND
2014-02-195810-072-1100ND
2014-02-201225-016-13000.578 ppm
2014-02-205810-016-13000.587 ppm
2014-02-245810-026-1145ND
2014-03-012385-016-17250.452 ppm
2014-03-012385-017-17150.226 ppm
2014-03-012385-046-1750ND
2014-03-012385-047-1800ND
2014-03-035810-077-13182.48 ppm
2014-03-035810-083-1306ND
2014-03-121225-082-0925ND
2014-03-261225-050-11501.56 ppm
2014-03-265810-050-11501.67 ppm
2014-04-035810-077-11263.16 ppm
2014-04-031225-082-1059ND
2014-04-035810-083-12010.587 ppm
2014-04-081225-082-1125ND
2014-04-101225-061-12501.88 ppm
2014-04-161225-029-12506.05 ppm
2014-04-161225-051-13354.62 ppm
2014-04-221225-050-11301.22 ppm
2014-04-241225-024-09001.78 ppm
2014-04-241225-092-1005ND
2014-04-291225-089-10300.140 ppm
2014-05-051225-056-14153.14 ppm
2014-05-051225-079-14152.07 ppm
2014-05-051225-079-14202.06 ppm
2014-05-135810-077-12103.39 ppm
2014-05-131225-082-1110ND
2014-05-141225-056-10263.59 ppm
2014-05-141225-079-10282.22 ppm
2014-05-211225-056-09303.82 ppm
2014-05-211225-079-09302.29 ppm
2014-05-275810-073-1030ND
2014-06-091225-002-1045ND
2014-06-091225-072-0915ND
2014-06-091225-073-0945ND
2014-06-091225-074-1100ND
2014-06-111225-006-1330ND
2014-06-111225-026-0915ND
2014-06-111225-053-1000ND
2014-06-115810-077-12303.16 ppm
2014-06-111225-082-1310ND
2014-06-111225-089-10000.140 ppm
2014-06-171225-092-1150ND
2014-06-231225-020-1030ND
2014-06-231225-052-1150ND
2014-07-021225-029-11005.91 ppm
2014-07-095810-077-10003.84 ppm
2014-07-095810-083-10002.03 ppm
2014-07-141225-082-1300ND
2014-07-281225-048-11100.775 ppm
2014-07-281225-050-10302.07 ppm
2014-08-075810-077-11503.16 ppm
2014-08-071225-082-1100ND
2014-09-085810-077-13453.16 ppm
2014-09-181225-056-09402.66 ppm
2014-09-181225-079-09401.67 ppm
2014-09-221225-082-1200ND
2014-09-231225-056-13301.89 ppm
2014-09-231225-079-13252.24 ppm
2014-09-291225-056-09252.00 ppm
2014-09-291225-079-09202.46 ppm
2014-10-071225-082-0940ND
2014-10-085810-077-10153.84 ppm
2014-10-095810-083-11303.84 ppm
2014-11-045810-077-14003.84 ppm
2014-11-041225-082-0930ND
2014-12-091225-082-1315ND
2014-12-105810-077-10003.84 ppm
2014-12-231225-085-0915ND
2014-12-231225-085-0915ND
2015-01-051225-024-10351.87 ppm
2015-01-061225-016-0840ND
2015-01-061225-017-0820ND
2015-01-061225-047-0910ND
2015-01-061225-072-0755ND
2015-01-065810-077-10403.61 ppm
2015-01-071225-048-13001.09 ppm
2015-01-071225-082-1020ND
2015-01-081225-006-1300ND
2015-01-081225-020-1350ND
2015-01-081225-052-1050ND
2015-01-081225-073-0950ND
2015-01-081225-074-1315ND
2015-01-201225-029-10555.69 ppm
2015-01-201225-033-1235ND
2015-01-201225-044-1015ND
2015-01-201225-045-1035ND
2015-01-201225-046-1155ND
2015-01-201225-051-10355.43 ppm
2015-02-101225-085-1330ND
2015-02-101225-085-1330ND
2015-02-191225-082-1055ND
2015-03-031225-082-1250ND
2015-03-041225-050-0955ND
2015-04-095810-077-10204.29 ppm
2015-04-091225-082-0915ND
2015-04-091225-082-0935ND
2015-05-261225-082-0930ND
2015-06-101225-050-11002.15 ppm
2015-06-101225-056-11001.89 ppm
2015-06-221225-082-0825ND
2015-07-081225-050-13553.32 ppm
2015-07-081225-050-13553.32 ppm
2015-07-081225-056-13503.48 ppm
2015-07-081225-056-13503.48 ppm
2015-07-095810-077-10553.61 ppm
2015-07-091225-082-09300.280 ppm
2015-07-091225-082-0930ND
2015-07-151225-029-12456.09 ppm
2015-07-151225-029-12456.09 ppm
2015-07-172385-056-16303.39 ppm
2015-07-201225-070-11500.130 ppm
2015-07-201225-070-1150ND
2015-08-061225-002-1030ND
2015-08-111225-082-10050.240 ppm
2015-08-191225-026-1230ND
2015-09-101225-082-0930ND
2015-10-151225-082-1345ND
2015-11-111225-082-1300ND
2015-12-081225-082-1105ND
2016-01-041225-051-13252.69 ppm
2016-01-051225-024-15002.00 ppm
2016-01-121225-002-1120ND
2016-01-121225-006-1000ND
2016-01-121225-016-1145ND
2016-01-121225-017-1130ND
2016-01-121225-026-0905ND
2016-01-121225-045-1215ND
2016-01-121225-046-1355ND
2016-01-121225-047-1000ND
2016-01-121225-052-0935ND
2016-01-121225-072-0850ND
2016-01-121225-074-1015ND
2016-01-205810-087-1055ND
2016-01-211225-048-11000.860 ppm
2016-01-261225-029-12005.50 ppm
2016-01-292385-082-16230.300 ppm
2016-02-031225-082-0950ND
2016-02-081225-016-1030ND
2016-02-081225-017-1000ND
2016-02-081225-044-1230ND
2016-02-081225-045-1200ND
2016-02-081225-047-1100ND
2016-03-025810-077-09204.20 ppm
2016-03-021225-082-1505ND
2016-03-025810-083-09301.50 ppm
2016-03-171225-073-1110ND
2016-04-061225-024-14101.78 ppm
2016-04-075810-077-11353.00 ppm
2016-04-071225-082-1010ND
2016-04-075810-083-10402.70 ppm
2016-04-191225-029-10005.70 ppm
2016-04-191225-051-11005.63 ppm
2016-04-261225-048-11150.810 ppm
2016-05-111225-082-10500.240 ppm
2016-05-121225-052-1010ND
2016-06-071225-026-10450.0400 ppm
2016-06-071225-072-1000ND
2016-06-071225-073-1020ND
2016-06-081225-002-13300.410 ppm
2016-06-081225-006-13000.520 ppm
2016-06-081225-074-13150.0800 ppm
2016-06-091225-082-11300.260 ppm
2016-07-065810-077-10552.20 ppm
2016-07-141225-029-10305.87 ppm
2016-07-202385-082-15400.1000 ppm
2016-07-261225-082-14400.150 ppm
2016-08-101225-082-11360.190 ppm
2016-08-221225-070-10100.130 ppm
2016-08-262385-056-14351.80 ppm
2016-08-291225-050-12152.93 ppm
2016-08-292385-056-12302.50 ppm
2016-09-061225-082-10500.180 ppm
2016-09-071225-056-10003.29 ppm
2016-09-081225-056-13303.47 ppm
2016-09-121225-056-11083.70 ppm
2016-09-201225-056-11323.57 ppm
2016-09-261225-056-11353.78 ppm
2016-10-031225-082-14300.190 ppm
2016-10-041225-050-11403.60 ppm
2016-10-041225-056-11503.72 ppm
2016-10-121225-056-09404.42 ppm
2016-10-181225-056-11113.79 ppm
2016-10-251225-056-13483.85 ppm
2016-10-311225-056-11304.34 ppm
2016-11-071225-056-12003.88 ppm
2016-11-071225-082-10020.180 ppm
2016-11-161225-056-12053.89 ppm
2016-11-221225-056-09054.72 ppm
2016-12-011225-056-13203.92 ppm
2016-12-051225-056-09153.91 ppm
2016-12-121225-082-14050.210 ppm
2016-12-131225-056-13504.44 ppm
2016-12-211225-056-13304.02 ppm
2016-12-271225-056-09303.69 ppm
2017-01-041225-002-12100.230 ppm
2017-01-041225-006-12300.170 ppm
2017-01-041225-052-1150ND
2017-01-041225-073-1130ND
2017-01-041225-074-12200.0400 ppm
2017-01-041225-087-1115ND
2017-01-051225-044-11250.0700 ppm
2017-01-051225-045-12150.0300 ppm
2017-01-051225-047-10200.270 ppm
2017-01-091225-048-12100.130 ppm
2017-01-111225-072-1200ND
2017-01-121225-016-11550.820 ppm
2017-01-121225-017-10450.440 ppm
2017-01-121225-026-0900ND
2017-01-122385-077-13472.10 ppm
2017-01-121225-082-13290.140 ppm
2017-01-122385-083-13400.600 ppm
2017-01-171225-029-12306.51 ppm
2017-01-171225-051-13306.35 ppm
2017-01-191225-046-14000.160 ppm
2017-01-301225-024-10351.44 ppm
2017-01-301225-050-15080.510 ppm
2017-02-071225-082-10400.130 ppm
2017-03-141225-085-13000.340 ppm
2017-03-151225-082-13220.170 ppm
2017-04-172385-077-11203.40 ppm
2017-04-172385-083-11250.900 ppm
2017-04-251225-082-10490.180 ppm
2017-04-251225-082-11120.180 ppm
2017-04-261225-050-09150.0300 ppm
2017-05-101225-082-09000.200 ppm
2017-06-022385-056-14120.800 ppm
2017-06-061225-056-09501.37 ppm
2017-06-121225-056-10002.69 ppm
2017-06-141225-082-11480.230 ppm
2017-06-191225-056-12153.20 ppm
2017-06-271225-056-11453.50 ppm
2017-07-051225-056-14003.61 ppm
2017-07-121225-050-10033.37 ppm
2017-07-121225-056-10153.68 ppm
2017-07-131225-082-09360.190 ppm
2017-07-171225-056-12103.63 ppm
2017-07-202385-077-11043.70 ppm
2017-07-202385-083-11100.800 ppm
2017-07-251225-056-11043.62 ppm
2017-07-311225-056-14503.68 ppm
2017-08-071225-056-09353.77 ppm
2017-08-101225-082-12140.200 ppm
2017-08-151225-056-10583.72 ppm
2017-08-182385-029-12005.90 ppm
2017-08-231225-056-13553.72 ppm
2017-08-281225-056-09053.73 ppm
2017-09-071225-056-10303.71 ppm
2017-09-131225-082-09350.190 ppm
2017-09-141225-056-11103.75 ppm
2017-09-211225-056-10503.66 ppm
2017-09-271225-056-10202.63 ppm
2017-10-021225-056-11503.69 ppm
2017-10-051225-050-13003.59 ppm
2017-10-162385-077-10454.40 ppm
2017-10-161225-082-10340.200 ppm
2017-10-162385-083-10472.30 ppm
2017-10-261225-056-11153.57 ppm
2017-10-311225-056-08503.57 ppm
2017-11-272385-082-13300.200 ppm
2017-11-292385-056-12003.30 ppm
2017-11-291225-082-11000.170 ppm
2017-12-071225-082-09300.160 ppm
2017-12-282385-033-1105ND
2018-01-101225-002-12250.0700 ppm
2018-01-101225-006-11450.130 ppm
2018-01-101225-026-1035ND
2018-01-101225-052-1305ND
2018-01-101225-072-0950ND
2018-01-101225-073-1340ND
2018-01-101225-074-1125ND
2018-01-111225-024-10262.19 ppm
2018-01-111225-048-10540.210 ppm
2018-01-112385-077-12053.50 ppm
2018-01-111225-082-11050.140 ppm
2018-01-112385-083-11550.700 ppm
2018-01-151225-044-11000.0900 ppm
2018-01-151225-045-11000.0800 ppm
2018-01-151225-051-10002.53 ppm
2018-01-161225-017-10300.720 ppm
2018-01-161225-087-1000ND
2018-01-171225-050-14454.20 ppm
2018-01-221225-016-12301.44 ppm
2018-01-221225-029-10006.12 ppm
2018-01-221225-047-12500.240 ppm
2018-01-231225-046-14500.130 ppm
2018-02-061225-082-12000.140 ppm
2018-04-111225-051-11404.76 ppm
2018-04-302385-077-09454.50 ppm
2018-04-301225-082-10420.160 ppm
2018-04-302385-083-09302.90 ppm
2018-05-011225-082-09200.170 ppm
2018-05-071225-082-14200.180 ppm
2018-05-112385-083-11151.60 ppm
2018-05-301225-050-11102.29 ppm
2018-06-061225-082-12550.160 ppm
2018-06-292385-056-10152.40 ppm
2018-07-021225-056-11253.40 ppm
2018-07-091225-050-08253.39 ppm
2018-07-091225-056-08353.45 ppm
2018-07-091225-070-10050.370 ppm
2018-07-181225-029-11156.43 ppm
2018-07-252385-077-10454.00 ppm
2018-07-251225-082-09350.160 ppm
2018-07-252385-083-11051.20 ppm
2018-08-011225-082-11050.150 ppm
2018-08-151225-056-09303.32 ppm
2018-08-221225-056-08003.01 ppm
2018-08-271225-056-11453.57 ppm
2018-09-051225-056-11403.28 ppm
2018-09-101225-056-08153.57 ppm
2018-09-121225-082-11500.200 ppm
2018-09-191225-056-11453.48 ppm
2018-09-241225-056-08303.52 ppm
2018-10-012385-077-13253.90 ppm
2018-10-011225-082-13170.170 ppm
2018-10-012385-083-13302.00 ppm
2018-10-021225-050-12053.42 ppm
2018-10-021225-056-09503.49 ppm
2018-11-081225-082-13490.170 ppm
2018-11-281225-056-09253.51 ppm
2018-12-051225-082-10050.160 ppm
2019-01-081225-024-10052.31 ppm
2019-01-091225-029-12456.58 ppm
2019-01-092385-077-11404.00 ppm
2019-01-091225-082-12300.150 ppm
2019-01-092385-083-11301.60 ppm
2019-01-141225-002-15000.0600 ppm
2019-01-141225-026-1340ND
2019-01-141225-052-1410ND
2019-01-141225-072-1230ND
2019-01-141225-073-1320ND
2019-01-141225-074-14300.120 ppm
2019-01-141225-087-12500.0500 ppm
2019-01-151225-085-15450.0800 ppm
2019-01-171225-050-15152.01 ppm
2019-01-281225-016-15300.360 ppm
2019-01-281225-017-16150.330 ppm
2019-01-281225-044-13150.150 ppm
2019-01-281225-045-12550.160 ppm
2019-01-281225-046-14000.400 ppm
2019-01-281225-047-14150.280 ppm
2019-01-291225-006-13450.230 ppm
2019-01-311225-048-16150.520 ppm
2019-02-071225-016-13350.360 ppm
2019-02-071225-017-13000.440 ppm
2019-02-071225-044-16500.330 ppm
2019-02-071225-045-17100.180 ppm
2019-02-071225-046-14300.460 ppm
2019-02-071225-047-15150.380 ppm
2019-02-191225-082-13260.150 ppm
2019-02-271225-056-13581.35 ppm
2019-03-012385-056-09152.90 ppm
2019-03-191225-029-13305.83 ppm
2019-03-191225-051-12302.68 ppm
2019-03-201225-024-12281.87 ppm
2019-03-211225-050-14150.300 ppm
2019-04-221225-051-15006.26 ppm
2019-04-221225-072-16400.01000 ppm
2019-04-221225-073-1600ND
2019-04-221225-087-16300.0400 ppm
2019-04-241225-002-14300.700 ppm
2019-04-241225-006-14000.570 ppm
2019-04-241225-050-12180.0600 ppm
2019-04-241225-052-1330ND
2019-04-241225-074-14500.250 ppm
2019-05-062385-077-11254.30 ppm
2019-05-061225-082-13500.220 ppm
2019-05-061225-082-13550.220 ppm
2019-05-062385-083-11202.10 ppm
2019-06-121225-082-16350.220 ppm
2019-06-131225-056-17300.320 ppm
2019-06-171225-056-13252.63 ppm
2019-07-021225-029-13456.26 ppm
2019-07-021225-050-17001.86 ppm
2019-07-021225-056-17101.96 ppm
2019-07-081225-056-14302.99 ppm
2019-07-102385-077-13153.90 ppm
2019-07-102385-083-13101.70 ppm
2019-07-231225-082-12020.240 ppm
2019-07-241225-048-14200.240 ppm
2019-08-071225-026-12300.01000 ppm
2019-08-081225-070-15300.230 ppm
2019-08-081225-082-14150.250 ppm
2019-09-041225-082-14250.240 ppm
2019-10-281225-050-17004.57 ppm
2019-12-112385-077-13454.80 ppm
2019-12-112385-083-13304.60 ppm