Nitrite
CTWC - Unionville System
Nitrite, closely related to the fertilizer chemical nitrate, comes from urban runoff and from fertilizer applied to agricultural lands to pollute drinking water. Nitrite is significantly more toxic than nitrate. Excessive nitrite in water can cause oxygen deprivation in infants and increase the risk of cancer.
22
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | ND | 6 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 3 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 3 | 0 | ND |
ppm = parts per million
State, National, and Health Guidelines for Drinking Water
EPA Maximum Contaminant
Level (MCL): 1 ppm
The legal limit for nitrite, established in 1991, was based on the rate of conversion of ingested nitrate into nitrite in adults. This limit may not fully protect against the risk of cancer due to nitrite exposure.
ppm = parts per million
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-04-10 | CA16951NOX | ND |
| 2018-04-10 | CA16950NOX | ND |
| 2018-07-23 | CA96742 | ND |
| 2018-07-23 | CA96743 | ND |
| 2018-11-06 | NOX 200511903 | ND |
| 2018-11-14 | IOC1 200512788 | ND |
| 2019-02-05 | NOX 200520747 | ND |
| 2019-02-05 | NOX 200520746 | ND |
| 2019-09-17 | NOX 200549386 | ND |
| 2019-09-17 | NOX 200549392 | ND |
| 2020-07-07 | NOX 200581835 | ND |
| 2020-07-07 | NOX 200581836 | ND |
| 2020-10-19 | NOX 200594470 | ND |
| 2021-03-02 | NOX 200608358 | ND |
| 2021-03-02 | NOX 200608357 | ND |
| 2021-09-22 | 300073532 300073533 | ND |
| 2022-03-14 | CK86780 | ND |
| 2022-03-14 | CK86779 | ND |
| 2022-08-23 | CM11959 | ND |
| 2023-01-24 | CN29187 | ND |
| 2023-01-24 | CN29186 | ND |
| 2023-08-01 | CO63104 | ND |