Know Your Environment. Protect Your Health.

Nitrate

City of Nampa

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.

 

110

Samples

0

Samples exceeding legal limit (MCL)

101

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.55 ppm1716ND - 6.10 ppm
20191.96 ppm1514ND - 6.30 ppm
20202.40 ppm1816ND - 6.70 ppm
20212.44 ppm1817ND - 6.40 ppm
20222.06 ppm2220ND - 6.40 ppm
20232.19 ppm2018ND - 6.30 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
2018-04-04I18144041.10 ppm
2018-10-08I18500181.80 ppm
2018-10-08I1850020ND
2018-10-08I18500222.00 ppm
2018-10-08I18500212.00 ppm
2018-10-08I18501091.40 ppm
2018-10-08I18500156.10 ppm
2018-10-08I18500162.20 ppm
2018-10-08I18500260.400 ppm
2018-10-08I18500241.000 ppm
2018-10-08I18500130.900 ppm
2018-10-08I18500142.50 ppm
2018-10-08I18500192.10 ppm
2018-10-08I18500230.400 ppm
2018-10-08I18500250.900 ppm
2018-10-08I18500271.20 ppm
2018-10-08I18500280.300 ppm
2019-09-17I19466620.400 ppm
2019-09-17I1946660ND
2019-09-17I19466592.50 ppm
2019-09-17I19466610.400 ppm
2019-09-17I19466660.400 ppm
2019-09-17I19466651.000 ppm
2019-09-17I19466641.70 ppm
2019-09-17I19466630.400 ppm
2019-09-18I19470165.70 ppm
2019-09-18I19470155.70 ppm
2019-09-18I19470170.400 ppm
2019-09-18I19470101.000 ppm
2019-09-18I19470070.800 ppm
2019-09-18I19470092.70 ppm
2019-09-18I19470086.30 ppm
2020-02-12I20065683.20 ppm
2020-06-02I20252706.70 ppm
2020-08-31I20429742.70 ppm
2020-08-31I2042972ND
2020-08-31I2042971ND
2020-08-31I20429692.80 ppm
2020-08-31I20429641.30 ppm
2020-08-31I20429630.900 ppm
2020-08-31I20429620.400 ppm
2020-08-31I20429610.400 ppm
2020-08-31I20429501.60 ppm
2020-08-31I20429490.900 ppm
2020-08-31I20429480.400 ppm
2020-08-31I20429735.60 ppm
2020-08-31I20429702.20 ppm
2020-08-31I20429686.50 ppm
2020-08-31I20429671.000 ppm
2020-10-01I20491676.60 ppm
2021-01-20I21029371.10 ppm
2021-01-20I21029310.300 ppm
2021-01-20I21029494.70 ppm
2021-01-20I21029360.600 ppm
2021-01-20I21029466.20 ppm
2021-01-20I21029382.70 ppm
2021-01-20I21029350.300 ppm
2021-01-20I21029321.000 ppm
2021-01-20I21029331.50 ppm
2021-01-20I2102947ND
2021-01-20I21029430.900 ppm
2021-01-20I21029340.400 ppm
2021-01-20I21029452.10 ppm
2021-01-20I21029442.80 ppm
2021-01-20I21029480.700 ppm
2021-04-21I21183096.00 ppm
2021-08-04I21397446.20 ppm
2021-11-08I21604306.40 ppm
2022-02-02I22053063.10 ppm
2022-02-02I22053050.900 ppm
2022-02-02I22053032.30 ppm
2022-02-02I22053022.90 ppm
2022-02-02I2205304ND
2022-02-02I22053011.000 ppm
2022-02-17I22080406.40 ppm
2022-06-09I22276090.400 ppm
2022-06-09I22276040.300 ppm
2022-06-09I22276031.60 ppm
2022-06-09I22276021.000 ppm
2022-06-09I22276001.30 ppm
2022-06-09I22275980.300 ppm
2022-06-09I22275962.30 ppm
2022-06-09I22275922.30 ppm
2022-06-09I22275912.30 ppm
2022-06-09I22275936.20 ppm
2022-06-09I22276103.00 ppm
2022-06-09I22275951.000 ppm
2022-06-13I2227928ND
2022-08-18I22407350.600 ppm
2022-11-16I22569796.20 ppm
2023-01-04I2300155-010.300 ppm
2023-01-04I2300155-02ND
2023-02-01I2302073-056.30 ppm
2023-05-10I2309050-016.20 ppm
2023-05-10I2309050-020.400 ppm
2023-08-03I2316314-011.000 ppm
2023-08-03I2316314-02ND
2023-08-03I2316314-030.400 ppm
2023-08-03I2316314-041.000 ppm
2023-08-03I2316314-056.00 ppm
2023-10-31I2323602-016.20 ppm
2023-10-31I2323593-010.400 ppm
2023-10-31I2323593-021.60 ppm
2023-10-31I2323593-033.00 ppm
2023-10-31I2323593-041.000 ppm
2023-10-31I2323593-050.200 ppm
2023-10-31I2323593-060.400 ppm
2023-10-31I2323593-093.40 ppm
2023-10-31I2323593-083.00 ppm
2023-10-31I2323593-073.00 ppm