Know Your Environment. Protect Your Health.

Nitrate

City of Woodway

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.

 

36

Samples

0

Samples exceeding legal limit (MCL)

15

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.247 ppm660.0400 ppm - 0.580 ppm
20190.278 ppm65ND - 1.14 ppm
20200.228 ppm64ND - 0.810 ppm
20210.135 ppm660.0600 ppm - 0.250 ppm
20220.103 ppm65ND - 0.180 ppm
20230.138 ppm660.0700 ppm - 0.310 ppm

ppm = parts per million

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.14 ppm

The EWG 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

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
2018-01-11AE088360.200 ppm
2018-01-11AE088340.0400 ppm
2018-11-06AE452900.0800 ppm
2018-11-06AE452910.0600 ppm
2018-11-06AE452930.580 ppm
2018-11-06AE452940.520 ppm
2019-02-12AE539651.14 ppm
2019-02-12AE539660.0800 ppm
2019-02-12AE53967ND
2019-08-12AE779190.120 ppm
2019-11-15AE893430.180 ppm
2019-11-15AE893440.150 ppm
2020-02-18AE985790.1000 ppm
2020-02-18AE985800.290 ppm
2020-05-11AF101630.810 ppm
2020-08-12AF23003ND
2020-08-12AF23005ND
2020-08-12AF230060.170 ppm
2021-01-19AF396430.0900 ppm
2021-01-19AF396460.0900 ppm
2021-01-19AF396450.190 ppm
2021-04-05AF488830.250 ppm
2021-04-05AF488840.130 ppm
2021-04-05AF488930.0600 ppm
2022-02-15AF847770.0800 ppm
2022-02-15AF847780.180 ppm
2022-02-15AF84779ND
2022-02-15AF847800.160 ppm
2022-04-13AF930380.0700 ppm
2022-04-13AF930410.130 ppm
2023-03-08AG320290.110 ppm
2023-04-24AG376170.310 ppm
2023-04-24AG376180.190 ppm
2023-04-24AG376190.0700 ppm
2023-04-24AG376200.0700 ppm
2023-07-13AG483610.0800 ppm