Nitrate and nitrite
Laurel Pump District
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.
78
Samples
0
Samples exceeding legal limit (MCL)
47
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 1.16 ppm | 13 | 7 | ND - 4.50 ppm |
| 2015 | 0.262 ppm | 13 | 4 | ND - 2.30 ppm |
| 2016 | 0.562 ppm | 13 | 5 | ND - 5.00 ppm |
| 2017 | 0.438 ppm | 13 | 7 | ND - 3.00 ppm |
| 2018 | 0.729 ppm | 13 | 13 | 0.286 ppm - 1.92 ppm |
| 2019 | 0.416 ppm | 13 | 11 | ND - 0.905 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 |
|---|---|---|
| 2014-01-13 | S531985 | 1.10 ppm |
| 2014-02-11 | S532058 | ND |
| 2014-03-19 | S532521 | 2.60 ppm |
| 2014-04-01 | S462942 | ND |
| 2014-04-24 | S479212 | ND |
| 2014-05-08 | S563025 | 0.300 ppm |
| 2014-06-10 | S563431 | ND |
| 2014-07-02 | S573044 | ND |
| 2014-08-13 | S573430 | 1.50 ppm |
| 2014-09-16 | S588490 | ND |
| 2014-10-09 | S588578 | 2.60 ppm |
| 2014-11-20 | S589537 | 2.50 ppm |
| 2014-12-10 | S589854 | 4.50 ppm |
| 2015-01-15 | S603149 | 0.300 ppm |
| 2015-02-05 | S603311 | ND |
| 2015-02-23 | S601958 | ND |
| 2015-03-10 | S603827 | ND |
| 2015-04-13 | S616923 | ND |
| 2015-05-12 | S617036 | 0.300 ppm |
| 2015-06-04 | S639991 | ND |
| 2015-07-23 | S640004 | 2.30 ppm |
| 2015-08-20 | S640019 | ND |
| 2015-09-09 | S640619 | ND |
| 2015-10-06 | S640020 | ND |
| 2015-11-03 | S643159 | ND |
| 2015-12-10 | S640579 | 0.500 ppm |
| 2016-01-07 | S643170 | 0.300 ppm |
| 2016-02-09 | S659775 | 5.00 ppm |
| 2016-02-22 | S659159 | ND |
| 2016-03-02 | S659798 | ND |
| 2016-04-13 | S640100 | ND |
| 2016-05-26 | S640314 | ND |
| 2016-06-29 | S671573 | ND |
| 2016-08-18 | S671718 | ND |
| 2016-08-18 | S671584 | ND |
| 2016-09-15 | S671822 | 1.40 ppm |
| 2016-10-27 | S671807 | 0.300 ppm |
| 2016-11-28 | S679698 | ND |
| 2016-12-13 | S671607 | 0.300 ppm |
| 2017-01-05 | S671612 | ND |
| 2017-01-27 | S679393 | 0.300 ppm |
| 2017-02-13 | S679700 | 0.300 ppm |
| 2017-03-13 | S671743 | 0.300 ppm |
| 2017-04-12 | S694206 | 0.800 ppm |
| 2017-05-16 | S694216 | 3.00 ppm |
| 2017-06-15 | S694321 | ND |
| 2017-07-21 | S737378 | 0.700 ppm |
| 2017-08-10 | S737434 | ND |
| 2017-09-12 | S757354 | ND |
| 2017-10-10 | S757404 | ND |
| 2017-11-14 | S757498 | ND |
| 2017-12-14 | S757506 | 0.300 ppm |
| 2018-01-24 | S757463 | 0.300 ppm |
| 2018-02-14 | S757771 | 0.400 ppm |
| 2018-03-13 | S757791 | 0.700 ppm |
| 2018-04-05 | S759344 | 0.864 ppm |
| 2018-04-06 | S770742 | 0.882 ppm |
| 2018-05-24 | S759352 | 0.286 ppm |
| 2018-06-05 | S759474 | 1.92 ppm |
| 2018-07-12 | S757801 | 0.644 ppm |
| 2018-08-30 | S759544 | 1.82 ppm |
| 2018-09-19 | S759570 | 0.530 ppm |
| 2018-10-16 | S759591 | 0.386 ppm |
| 2018-11-14 | S757813 | 0.413 ppm |
| 2018-12-13 | S759672 | 0.340 ppm |
| 2019-01-10 | S759676 | 0.644 ppm |
| 2019-02-21 | S759643 | 0.905 ppm |
| 2019-03-12 | S759633 | 0.489 ppm |
| 2019-03-22 | S817053 | 0.665 ppm |
| 2019-04-02 | S759636 | 0.533 ppm |
| 2019-05-23 | S759282 | 0.332 ppm |
| 2019-06-20 | S759290 | ND |
| 2019-07-24 | S759728 | 0.648 ppm |
| 2019-08-21 | S759703 | 0.386 ppm |
| 2019-09-03 | S759704 | 0.262 ppm |
| 2019-10-18 | S895865 | 0.285 ppm |
| 2019-11-12 | S759358 | ND |
| 2019-12-09 | S919987 | 0.260 ppm |