Nitrate and nitrite
Lake County East 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.
28
Samples
0
Samples exceeding legal limit (MCL)
24
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 | 0.211 ppm | 7 | 6 | ND - 0.550 ppm |
| 2018 | 0.381 ppm | 11 | 11 | 0.170 ppm - 0.810 ppm |
| 2019 | 0.350 ppm | 10 | 9 | ND - 0.780 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 |
|---|---|---|
| 2017-06-20 | 17-21195-04 | 0.550 ppm |
| 2017-07-18 | 17-23276-02 | 0.310 ppm |
| 2017-08-22 | 17-26079-03 | 0.130 ppm |
| 2017-09-19 | 17-28442-02 | ND |
| 2017-10-23 | 17-30640-03 | 0.170 ppm |
| 2017-11-20 | 17-32478-02 | 0.150 ppm |
| 2017-12-19 | 17-34266-02 | 0.170 ppm |
| 2018-01-09 | 18-10545-03A | 0.230 ppm |
| 2018-02-13 | 18-12779-07 | 0.280 ppm |
| 2018-04-10 | 18-16526-03A | 0.810 ppm |
| 2018-05-08 | 18-18593-07 | 0.630 ppm |
| 2018-06-12 | 18-21553-03 | 0.610 ppm |
| 2018-07-10 | M18-23986-03 | 0.480 ppm |
| 2018-08-08 | 18-26716-07 | 0.300 ppm |
| 2018-09-11 | 18-29551-03 | 0.200 ppm |
| 2018-10-10 | 18-32312-03 | 0.280 ppm |
| 2018-11-14 | 18-34949-07 | 0.200 ppm |
| 2018-12-11 | 18-36841-03 | 0.170 ppm |
| 2019-01-08 | 19-11091-01A | 0.250 ppm |
| 2019-02-12 | M19-12878-07 | 0.730 ppm |
| 2019-03-12 | 19-15330-03 | 0.320 ppm |
| 2019-04-09 | 19-17025-03A | 0.500 ppm |
| 2019-05-14 | 19-19682-07 | 0.780 ppm |
| 2019-06-11 | 19-22007-03 | 0.340 ppm |
| 2019-07-09 | 19-24438-03 | 0.270 ppm |
| 2019-08-13 | M19-27624-07 | 0.190 ppm |
| 2019-09-10 | 19-30116-03 | 0.120 ppm |
| 2019-10-08 | 19-32804-01 | ND |