Nitrate and nitrite
Lake County West Water Subdistrict
Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.
29
Samples
0
Samples exceeding legal limit (MCL)
22
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | 0.217 ppm | 7 | 6 | ND - 0.620 ppm |
| 2018 | 0.420 ppm | 12 | 12 | 0.130 ppm - 0.920 ppm |
| 2019 | 0.399 ppm | 10 | 10 | 0.110 ppm - 0.710 ppm |
ppm = parts per million
State and national drinking water standards and health guidelines
EWG Health Guideline 0.14 ppm
The 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
ppm = parts per million
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2017-06-13 | 17-20519-04 | 0.620 ppm |
| 2017-07-11 | 17-22703-04 | 0.320 ppm |
| 2017-08-09 | 17-25034-02 | 0.130 ppm |
| 2017-09-06 | 17-27060-03 | 0.170 ppm |
| 2017-10-12 | 17-29884-06 | 0.140 ppm |
| 2017-11-13 | 17-31944-06 | ND |
| 2017-12-13 | 17-33947-05 | 0.140 ppm |
| 2018-01-10 | 18-10711-05A | 0.220 ppm |
| 2018-02-13 | 18-12615-06 | 0.350 ppm |
| 2018-03-13 | 18-14555-05 | 0.530 ppm |
| 2018-04-11 | 18-16665-05 | 0.920 ppm |
| 2018-05-09 | 18-18769-06 | 0.720 ppm |
| 2018-06-12 | 18-21584-03 | 0.800 ppm |
| 2018-07-11 | 18-24183-03 | 0.450 ppm |
| 2018-08-08 | 18-26753-06 | 0.330 ppm |
| 2018-09-11 | 18-29550-05 | 0.160 ppm |
| 2018-10-09 | 18-32114-05 | 0.200 ppm |
| 2018-11-13 | 18-35071-01 | 0.130 ppm |
| 2018-12-11 | 18-36858-05 | 0.230 ppm |
| 2019-01-09 | 19-10760-05 | 0.260 ppm |
| 2019-02-13 | M19-13054-06 | 0.540 ppm |
| 2019-03-12 | 19-14883-03 | 0.440 ppm |
| 2019-04-09 | 19-17032-04A | 0.660 ppm |
| 2019-05-14 | 19-19684-06 | 0.710 ppm |
| 2019-06-12 | 19-22162-03 | 0.550 ppm |
| 2019-07-09 | 19-24440-03 | 0.420 ppm |
| 2019-08-13 | M19-27642-05 | 0.170 ppm |
| 2019-09-11 | 19-30314-03 | 0.130 ppm |
| 2019-10-09 | 19-32830-03 | 0.110 ppm |