Know Your Environment. Protect Your Health.

Nitrate

City of Caldwell

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.

 

87

Samples

0

Samples exceeding legal limit (MCL)

76

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.580 ppm1513ND - 1.90 ppm
20190.633 ppm1512ND - 2.70 ppm
20200.593 ppm1514ND - 2.00 ppm
20210.627 ppm1514ND - 2.20 ppm
20220.792 ppm1210ND - 3.00 ppm
20230.727 ppm1513ND - 3.20 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
2018-07-31I18365910.300 ppm
2018-07-31I18365900.300 ppm
2018-07-31I1836589ND
2018-07-31I18365880.300 ppm
2018-07-31I1836587ND
2018-07-31I18365861.10 ppm
2018-07-31I18365850.300 ppm
2018-07-31I18365840.200 ppm
2018-07-31I18365830.300 ppm
2018-07-31I18365820.600 ppm
2018-07-31I18365811.90 ppm
2018-07-31I18365950.300 ppm
2018-07-31I18365940.900 ppm
2018-07-31I18365931.90 ppm
2018-07-31I18365920.300 ppm
2019-08-06I19385940.400 ppm
2019-08-06I19385930.300 ppm
2019-08-06I19386010.200 ppm
2019-08-06I19385990.300 ppm
2019-08-06I1938595ND
2019-08-06I1938591ND
2019-08-06I19385970.600 ppm
2019-08-19I19411711.20 ppm
2019-08-19I19411790.500 ppm
2019-08-19I19411772.10 ppm
2019-08-19I19411742.70 ppm
2019-08-19I19411720.400 ppm
2019-08-19I19411830.400 ppm
2019-08-19I19411810.400 ppm
2019-08-19I1941176ND
2020-12-21I20643630.200 ppm
2020-12-21I20643620.300 ppm
2020-12-21I20643640.400 ppm
2020-12-21I20643650.400 ppm
2020-12-21I20643660.300 ppm
2020-12-21I20643670.300 ppm
2020-12-21I20643680.300 ppm
2020-12-21I20643700.600 ppm
2020-12-21I20643691.000 ppm
2020-12-22I20643560.200 ppm
2020-12-22I20643571.40 ppm
2020-12-22I20643580.400 ppm
2020-12-22I20643592.00 ppm
2020-12-22I20643601.10 ppm
2020-12-22I2064361ND
2021-06-30I21327030.300 ppm
2021-06-30I21327020.300 ppm
2021-08-02I21393010.200 ppm
2021-08-02I21393020.400 ppm
2021-09-16I21489561.50 ppm
2021-09-16I21489550.200 ppm
2021-10-28I21583430.700 ppm
2021-10-28I21583411.10 ppm
2021-10-28I21583420.300 ppm
2021-11-15I21621520.400 ppm
2021-11-15I21821540.300 ppm
2021-11-15I21621512.20 ppm
2021-11-15I21621530.400 ppm
2021-11-15I21621401.10 ppm
2021-12-01I2164374ND
2022-06-28I22308371.90 ppm
2022-06-29I22310810.300 ppm
2022-07-06I22319930.300 ppm
2022-07-06I22319940.300 ppm
2022-07-06I22320010.400 ppm
2022-07-13I22335092.20 ppm
2022-07-20I22348560.600 ppm
2022-07-20I2234857ND
2022-07-20I22348580.300 ppm
2022-07-27I2236310ND
2022-08-01I22369573.00 ppm
2022-08-03I22377000.200 ppm
2023-08-29I2318465-01ND
2023-08-29I2318465-020.300 ppm
2023-08-29I2318465-030.200 ppm
2023-08-29I2318465-040.300 ppm
2023-08-29I2318465-05ND
2023-08-29I2318465-061.80 ppm
2023-08-29I2318465-070.700 ppm
2023-08-29I2318465-080.300 ppm
2023-08-29I2318465-093.20 ppm
2023-08-29I2318465-102.20 ppm
2023-08-29I2318465-110.400 ppm
2023-08-292318465-120.300 ppm
2023-08-29I2318465-130.600 ppm
2023-09-21I2320437-020.300 ppm
2023-09-21I2320437-010.300 ppm