Know Your Environment. Protect Your Health.

Nitrate

City of Post Falls

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.

 

89

Samples

0

Samples exceeding legal limit (MCL)

89

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.986 ppm21210.430 ppm - 1.39 ppm
20190.968 ppm14140.444 ppm - 1.45 ppm
20200.874 ppm10100.395 ppm - 1.17 ppm
20210.687 ppm11110.367 ppm - 0.939 ppm
20220.741 ppm12120.484 ppm - 0.952 ppm
20230.747 ppm21210.371 ppm - 1.76 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
2018-03-13I1803130430041.20 ppm
2018-03-13I1803130430031.13 ppm
2018-03-13I1803130430011.06 ppm
2018-03-13I1803130430021.14 ppm
2018-07-17I1807170540010.734 ppm
2018-07-17I1807170540031.13 ppm
2018-07-17I1807170540041.12 ppm
2018-07-17I1707170540031.13 ppm
2018-07-17I1807170540020.753 ppm
2018-07-1781807170540010.734 ppm
2018-11-06I1811060390041.10 ppm
2018-11-06I1811060390020.638 ppm
2018-11-06I1811060390031.04 ppm
2018-11-06I1811060390011.04 ppm
2018-12-18N2002870.640 ppm
2018-12-18N2002861.27 ppm
2018-12-18N2002850.650 ppm
2018-12-18N2002841.39 ppm
2018-12-18N2002830.430 ppm
2018-12-19N2003271.15 ppm
2018-12-19N2003261.23 ppm
2019-03-12I1903120400010.922 ppm
2019-03-12I1903120400021.01 ppm
2019-03-12I1903120400031.20 ppm
2019-07-16I1907160240031.13 ppm
2019-07-16I190716240010.444 ppm
2019-07-16I1907160240020.787 ppm
2019-07-16I1907160240041.12 ppm
2019-11-12I2108911.09 ppm
2019-11-13I2109411.10 ppm
2019-11-18I2110590.673 ppm
2019-11-18I2110620.648 ppm
2019-11-19I2111030.802 ppm
2019-12-09I2117161.18 ppm
2019-12-16I2119171.45 ppm
2020-03-25IMAC0261031.12 ppm
2020-03-25IMAC0261010.867 ppm
2020-03-25IMAC0261021.09 ppm
2020-09-22N2208570.923 ppm
2020-09-22N2208530.907 ppm
2020-09-22N2208551.17 ppm
2020-09-22N2208540.968 ppm
2020-09-22N12801470.620 ppm
2020-09-22N2208510.395 ppm
2020-09-22N2208560.676 ppm
2021-09-01IMBI0053010.367 ppm
2021-11-23N2357460.939 ppm
2021-11-23N2357440.507 ppm
2021-11-23N2357450.786 ppm
2021-11-23N2357470.600 ppm
2021-11-29N2358560.468 ppm
2021-11-29N2357960.628 ppm
2021-11-29N2357970.749 ppm
2021-12-10NMBL0381010.899 ppm
2021-12-10NMBL0381030.757 ppm
2021-12-10NMBL0381020.854 ppm
2022-03-09I2386910.859 ppm
2022-03-09N2386900.952 ppm
2022-03-14I2387670.692 ppm
2022-03-14N2387660.897 ppm
2022-03-23PHDMCC0811030.686 ppm
2022-03-23PHDMCC0811020.935 ppm
2022-06-06I2417080.651 ppm
2022-06-07I2417350.484 ppm
2022-07-13I2435110.540 ppm
2022-11-10PHDMCK0358030.674 ppm
2022-11-10PHDMCK0358020.739 ppm
2022-11-10PHDMCK0357010.780 ppm
2023-01-23N2515000.902 ppm
2023-01-23N2515010.847 ppm
2023-01-25N2515630.457 ppm
2023-03-24IMDC0835030.880 ppm
2023-03-24IMDC0835010.828 ppm
2023-03-24IMDC0835020.466 ppm
2023-03-24IMDC0835040.685 ppm
2023-05-15N2548890.583 ppm
2023-05-15N2548900.860 ppm
2023-05-15N2548910.374 ppm
2023-05-15N2548920.645 ppm
2023-05-15N2548930.777 ppm
2023-05-15I2548940.371 ppm
2023-07-25IMDG0817010.555 ppm
2023-07-25IMDG0817030.582 ppm
2023-07-25IMDG0817050.705 ppm
2023-11-30MDL0010051.76 ppm
2023-11-30MDL0010030.778 ppm
2023-11-30MDL0010041.09 ppm
2023-11-30MDL0010010.779 ppm
2023-12-13N2631470.753 ppm