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EWG's Tap Water Database — 2019 UPDATE

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Nitrate

City of Houston

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.

 

269

Samples

0

Samples exceeding legal limit (MCL)

149

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.187 ppm4234ND - 1.23 ppm
20130.204 ppm5442ND - 0.640 ppm
20140.202 ppm4635ND - 0.800 ppm
20150.192 ppm4131ND - 0.850 ppm
20160.188 ppm4231ND - 0.810 ppm
20170.248 ppm4434ND - 0.950 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
2012-01-31AB796930.390 ppm
2012-01-31AB796910.250 ppm
2012-01-31AB796900.360 ppm
2012-01-31AB796890.310 ppm
2012-01-31AB796920.260 ppm
2012-01-31AB796940.220 ppm
2012-02-01AB796820.580 ppm
2012-02-01AB796810.550 ppm
2012-02-01AB796800.320 ppm
2012-02-01AB796831.23 ppm
2012-04-10AB863750.150 ppm
2012-04-10AB863690.270 ppm
2012-04-10AB863660.01000 ppm
2012-04-10AB863700.0300 ppm
2012-04-10AB863680.01000 ppm
2012-05-23AB90553ND
2012-05-23AB90561ND
2012-05-23AB905600.130 ppm
2012-05-23AB90552ND
2012-05-23AB90546ND
2012-05-23AB90566ND
2012-05-23AB905620.170 ppm
2012-06-12AB922620.0800 ppm
2012-06-12AB922660.150 ppm
2012-06-12AB92265ND
2012-06-12AB922630.0200 ppm
2012-06-12AB922610.240 ppm
2012-07-24AB96029ND
2012-07-24AB960260.300 ppm
2012-07-24AB960210.180 ppm
2012-07-24AB960180.190 ppm
2012-07-24AB960170.0300 ppm
2012-07-24AB960190.0200 ppm
2012-07-24AB960160.280 ppm
2012-07-24AB960200.160 ppm
2012-11-19AC053740.160 ppm
2012-11-19AC053790.150 ppm
2012-11-19AC053780.220 ppm
2012-11-19AC053750.280 ppm
2012-11-19AC05376ND
2012-11-19AC053730.01000 ppm
2012-11-19AC053770.130 ppm
2013-02-25AC115010.610 ppm
2013-02-25AC115050.580 ppm
2013-02-25AC115020.600 ppm
2013-02-25AC114970.570 ppm
2013-02-25AC115000.550 ppm
2013-02-26AC116760.640 ppm
2013-02-26AC114940.0300 ppm
2013-03-11AC128460.300 ppm
2013-03-11AC128440.410 ppm
2013-03-11AC128420.220 ppm
2013-03-11AC128450.640 ppm
2013-06-13AC219650.210 ppm
2013-06-13AC219660.280 ppm
2013-08-08AC271410.290 ppm
2013-08-08AC271430.250 ppm
2013-08-08AC271400.270 ppm
2013-08-08AC271380.230 ppm
2013-08-08AC271420.240 ppm
2013-08-08AC271370.200 ppm
2013-08-08AC271390.0700 ppm
2013-09-24AC31083ND
2013-09-25AC312360.140 ppm
2013-09-25AC312380.170 ppm
2013-09-25AC312460.220 ppm
2013-10-24AC33170ND
2013-10-24AC33171ND
2013-10-24AC33168ND
2013-10-24AC331690.220 ppm
2013-10-24AC33156ND
2013-10-24AC33155ND
2013-10-24AC33158ND
2013-10-24AC331570.140 ppm
2013-10-29AC33577ND
2013-10-29AC335510.0600 ppm
2013-10-29AC335540.150 ppm
2013-10-29AC335530.180 ppm
2013-10-29AC33552ND
2013-10-29AC335560.190 ppm
2013-10-29AC33557ND
2013-10-29AC335610.0400 ppm
2013-10-29AC33555ND
2013-10-29AC335580.240 ppm
2013-11-04AC339750.0200 ppm
2013-11-04AC339280.280 ppm
2013-11-04AC339260.250 ppm
2013-11-04AC339300.220 ppm
2013-11-04AC339250.340 ppm
2013-11-04AC339290.190 ppm
2013-11-04AC339320.280 ppm
2013-11-04AC339360.01000 ppm
2013-11-04AC339270.01000 ppm
2013-11-04AC339310.310 ppm
2013-12-17AC377350.160 ppm
2013-12-17AC37725ND
2014-02-03AC409940.800 ppm
2014-02-03AC409790.780 ppm
2014-03-14AC470390.510 ppm
2014-03-14AC470380.410 ppm
2014-03-14AC470370.360 ppm
2014-04-16AC50720ND
2014-04-16AC50723ND
2014-04-16AC507240.700 ppm
2014-04-16AC507340.660 ppm
2014-04-17AC509930.160 ppm
2014-04-17AC509900.120 ppm
2014-04-17AC509910.300 ppm
2014-04-17AC509940.150 ppm
2014-04-17AC50992ND
2014-04-17AC509950.01000 ppm
2014-04-17AC509960.300 ppm
2014-04-17AC509970.170 ppm
2014-06-03AC557550.0200 ppm
2014-06-03AC557540.0200 ppm
2014-06-03AC557530.250 ppm
2014-06-03AC557500.480 ppm
2014-06-03AC557570.240 ppm
2014-07-15AC596590.300 ppm
2014-07-15AC596600.290 ppm
2014-07-16AC59795ND
2014-08-14AC635820.160 ppm
2014-08-14AC63605ND
2014-08-14AC63597ND
2014-10-08AC691050.300 ppm
2014-10-08AC691060.370 ppm
2014-10-08AC691070.270 ppm
2014-10-09AC69305ND
2014-10-09AC693060.01000 ppm
2014-10-09AC693130.0700 ppm
2014-10-09AC693150.0400 ppm
2014-10-09AC693160.150 ppm
2014-12-09AC74088ND
2014-12-09AC740860.150 ppm
2014-12-09AC741160.260 ppm
2014-12-09AC740870.270 ppm
2014-12-09AC741150.160 ppm
2014-12-09AC74114ND
2014-12-18AC75397ND
2014-12-18AC753960.0200 ppm
2014-12-18AC75400ND
2014-12-18AC754010.0200 ppm
2015-03-04AC827590.01000 ppm
2015-03-04AC827860.560 ppm
2015-03-05AC827690.0300 ppm
2015-03-05AC827980.580 ppm
2015-03-24AC857780.310 ppm
2015-06-04AC945400.160 ppm
2015-06-04AC945390.01000 ppm
2015-06-04AC94552ND
2015-06-04AC945550.210 ppm
2015-06-04AC945530.850 ppm
2015-06-04AC945540.640 ppm
2015-07-21AD00268ND
2015-07-21AD00267ND
2015-07-21AD002950.410 ppm
2015-07-21AD002970.400 ppm
2015-07-21AD002940.300 ppm
2015-07-21AD002960.290 ppm
2015-07-22AD005300.0700 ppm
2015-07-22AD005330.01000 ppm
2015-07-22AD005320.01000 ppm
2015-07-22AD005310.240 ppm
2015-09-17AD074880.230 ppm
2015-10-22AD113860.190 ppm
2015-10-22AD11381ND
2015-10-22AD11385ND
2015-10-22AD113830.0600 ppm
2015-10-22AD113820.130 ppm
2015-10-22AD11387ND
2015-10-22AD11384ND
2015-10-22AD11388ND
2015-11-12AD132700.350 ppm
2015-11-12AD132690.110 ppm
2015-11-12AD132680.240 ppm
2015-11-12AD132740.270 ppm
2015-11-12AD13271ND
2015-11-12AD132720.220 ppm
2015-11-12AD132730.270 ppm
2015-11-12AD132750.160 ppm
2015-11-12AD132920.410 ppm
2015-12-08AD158590.130 ppm
2015-12-08AD15875ND
2016-02-18AD241620.200 ppm
2016-02-18AD241240.580 ppm
2016-02-18AD241260.0700 ppm
2016-02-18AD241210.310 ppm
2016-02-18AD241250.130 ppm
2016-02-18AD241220.210 ppm
2016-02-18AD241230.210 ppm
2016-03-03AD268010.810 ppm
2016-03-16AD289480.780 ppm
2016-03-16AD289470.720 ppm
2016-03-17AD29277ND
2016-03-17AD292760.810 ppm
2016-03-23AD300350.150 ppm
2016-03-23AD30037ND
2016-03-23AD300340.180 ppm
2016-03-23AD300010.130 ppm
2016-03-23AD300020.240 ppm
2016-06-08AD396590.230 ppm
2016-06-08AD396610.0300 ppm
2016-06-08AD396600.260 ppm
2016-06-16AD408620.170 ppm
2016-06-16AD40861ND
2016-06-16AD408600.1000 ppm
2016-09-20AD502620.260 ppm
2016-09-20AD502630.160 ppm
2016-09-21AD506270.180 ppm
2016-10-06AD526120.0800 ppm
2016-10-06AD52609ND
2016-10-06AD52610ND
2016-10-06AD526110.210 ppm
2016-10-06AD526130.160 ppm
2016-10-06AD52601ND
2016-10-06AD52598ND
2016-10-06AD52599ND
2016-10-06AD52605ND
2016-11-18AD58676ND
2016-11-21AD587150.01000 ppm
2016-11-21AD586860.130 ppm
2016-11-21AD586840.230 ppm
2016-11-21AD58682ND
2016-11-21AD586850.160 ppm
2016-11-21AD586830.01000 ppm
2017-01-26AD669880.280 ppm
2017-01-26AD669860.330 ppm
2017-01-26AD669850.0900 ppm
2017-01-26AD669480.180 ppm
2017-02-28AD723140.860 ppm
2017-02-28AD723190.800 ppm
2017-03-01AD726600.880 ppm
2017-03-01AD726590.840 ppm
2017-03-02AD729530.950 ppm
2017-03-02AD729520.710 ppm
2017-03-28AD770330.170 ppm
2017-03-28AD770340.190 ppm
2017-03-28AD770360.270 ppm
2017-03-28AD770350.490 ppm
2017-03-28AD770040.210 ppm
2017-03-29AD77322ND
2017-03-29AD773360.01000 ppm
2017-03-29AD77308ND
2017-03-29AD773090.0200 ppm
2017-04-26AD81069ND
2017-04-27AD813690.0200 ppm
2017-07-06AD88401ND
2017-07-06AD884020.01000 ppm
2017-07-06AD884030.240 ppm
2017-07-25AD904550.300 ppm
2017-09-11AD95335ND
2017-09-11AD953370.0400 ppm
2017-09-11AD953360.380 ppm
2017-09-11AD95305ND
2017-09-11AD953120.0200 ppm
2017-09-11AD953030.0200 ppm
2017-09-11AD953040.210 ppm
2017-09-26AD978960.120 ppm
2017-09-26AD978940.820 ppm
2017-09-26AD978930.540 ppm
2017-09-26AD978950.410 ppm
2017-11-07AE03760ND
2017-11-07AE03762ND
2017-11-07AE037610.0200 ppm
2017-11-07AE037640.180 ppm
2017-11-07AE037630.140 ppm
2017-11-14AE04636ND
2017-12-04AE064680.150 ppm
2017-12-04AE06467ND