Nitrate
Myoma Dunes Mutual Water Company
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 0.603 ppm | 3 | 3 | 0.530 ppm - 0.740 ppm |
| 2019 | 0.695 ppm | 8 | 7 | ND - 1.000 ppm |
| 2020 | 0.594 ppm | 5 | 4 | ND - 1.000 ppm |
| 2021 | 0.684 ppm | 5 | 5 | 0.530 ppm - 0.880 ppm |
| 2022 | 0.779 ppm | 16 | 16 | 0.560 ppm - 1.000 ppm |
| 2023 | 0.782 ppm | 5 | 5 | 0.570 ppm - 1.10 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 |
|---|---|---|
| 2018-11-19 | CA3310051_008_008-201811191033 | 0.540 ppm |
| 2018-11-19 | CA3310051_007_007-201811191011 | 0.740 ppm |
| 2018-12-17 | CA3310051_011_011-201812170935 | 0.530 ppm |
| 2019-04-01 | CA3310051_010_010-201904010730 | 0.860 ppm |
| 2019-11-18 | CA3310051_011_011-201911180823 | ND |
| 2019-11-18 | CA3310051_007_007-201911180850 | 0.560 ppm |
| 2019-11-18 | CA3310051_008_008-201911180751 | 0.650 ppm |
| 2019-11-18 | CA3310051_011_011-201911180951 | 0.690 ppm |
| 2019-11-22 | CA3310051_010_010-201911220939 | 1.000 ppm |
| 2019-11-22 | CA3310051_010_010-201911220912 | 1.000 ppm |
| 2019-11-22 | CA3310051_009_009-201911220839 | 0.800 ppm |
| 2020-08-24 | CA3310051_011_011-202008241235 | 0.760 ppm |
| 2020-08-24 | CA3310051_008_008-202008241145 | 0.610 ppm |
| 2020-08-24 | CA3310051_007_007-202008241135 | ND |
| 2020-08-24 | CA3310051_010_010-202008241320 | 1.000 ppm |
| 2020-08-24 | CA3310051_009_009-202008241100 | 0.600 ppm |
| 2021-08-23 | CA3310051_009_009-202108230722 | 0.650 ppm |
| 2021-08-23 | CA3310051_007_007-202108230855 | 0.650 ppm |
| 2021-08-23 | CA3310051_008_008-202108230830 | 0.530 ppm |
| 2021-08-23 | CA3310051_010_010-202108230630 | 0.880 ppm |
| 2021-08-23 | CA3310051_011_011-202108230713 | 0.710 ppm |
| 2022-08-16 | CA3310051_009_009-202208160756 | 0.700 ppm |
| 2022-08-16 | CA3310051_011_011-202208160654 | 0.850 ppm |
| 2022-08-16 | CA3310051_008_008-202208160827 | 0.560 ppm |
| 2022-08-16 | CA3310051_007_007-202208160855 | 0.690 ppm |
| 2022-08-16 | CA3310051_010_010-202208160721 | 1.000 ppm |
| 2022-08-19 | CA3310051_008_008-202208190935 | 0.610 ppm |
| 2022-08-19 | CA3310051_010_010-202208190749 | 1.000 ppm |
| 2022-08-19 | CA3310051_011_011-202208190752 | 0.850 ppm |
| 2022-08-19 | CA3310051_010_010-202208190715 | 1.000 ppm |
| 2022-08-19 | CA3310051_009_009-202208190919 | 0.720 ppm |
| 2022-08-19 | CA3310051_007_007-202208190903 | 0.750 ppm |
| 2022-08-23 | CA3310051_008_008-202208230750 | 0.620 ppm |
| 2022-08-23 | CA3310051_007_007-202208230824 | 0.760 ppm |
| 2022-08-23 | CA3310051_011_011-202208230705 | 0.770 ppm |
| 2022-08-23 | CA3310051_010_010-202208230842 | 1.000 ppm |
| 2022-08-23 | CA3310051_009_009-202208230805 | 0.590 ppm |
| 2023-08-22 | CA3310051_009_009-202308220800 | 0.570 ppm |
| 2023-08-22 | CA3310051_011_011-202308221012 | 0.880 ppm |
| 2023-08-22 | CA3310051_007_007-202308220741 | 0.750 ppm |
| 2023-08-22 | CA3310051_008_008-202308220727 | 0.610 ppm |
| 2023-08-22 | CA3310051_010_010-202308220856 | 1.10 ppm |