Nitrate and nitrite
Hammond
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.
105
Samples
0
Samples exceeding legal limit (MCL)
105
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.882 ppm | 15 | 15 | 0.176 ppm - 1.97 ppm |
| 2015 | 0.916 ppm | 13 | 13 | 0.205 ppm - 1.35 ppm |
| 2016 | 0.784 ppm | 13 | 13 | 0.164 ppm - 1.50 ppm |
| 2017 | 1.02 ppm | 13 | 13 | 0.218 ppm - 1.54 ppm |
| 2018 | 0.587 ppm | 26 | 26 | 0.191 ppm - 1.91 ppm |
| 2019 | 0.592 ppm | 25 | 25 | 0.180 ppm - 1.37 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 |
|---|---|---|
| 2014-01-14 | SA40159-01_01 | 0.176 ppm |
| 2014-01-14 | SA40159-02_01 | 0.688 ppm |
| 2014-02-12 | SB40259-01_01 | 0.647 ppm |
| 2014-03-04 | SC40057-01_01 | 0.661 ppm |
| 2014-04-08 | SD40263-01_01 | 0.933 ppm |
| 2014-05-14 | SE40681-01_01 | 0.890 ppm |
| 2014-06-04 | SF40207-01_01 | 1.97 ppm |
| 2014-06-06 | SF40367-01_01 | 0.200 ppm |
| 2014-06-10 | SF40490-01_01 | 1.02 ppm |
| 2014-07-15 | SG40841-02_01 | 0.791 ppm |
| 2014-08-12 | SH40809-02_01 | 1.20 ppm |
| 2014-09-09 | SI40431-02_01 | 1.03 ppm |
| 2014-10-14 | SJ40706-02_01 | 1.30 ppm |
| 2014-11-04 | SK40051-02_01 | 0.735 ppm |
| 2014-12-09 | SL40300-02_01 | 0.990 ppm |
| 2015-01-20 | SA50441-02_01 | 0.941 ppm |
| 2015-02-10 | SB50227-02_01 | 0.864 ppm |
| 2015-03-10 | SC50231-02_01 | 0.849 ppm |
| 2015-04-07 | SD50196-02_01 | 0.205 ppm |
| 2015-04-07 | SD50196-01_01 | 0.529 ppm |
| 2015-05-12 | SE50444-02_01 | 0.804 ppm |
| 2015-06-02 | SF50160-02_01 | 1.35 ppm |
| 2015-07-14 | SG50774-02_01 | 1.07 ppm |
| 2015-08-11 | SH50641-02_01 | 0.911 ppm |
| 2015-09-15 | SI50679-02_01 | 1.04 ppm |
| 2015-10-06 | SJ50259-01_01 | 1.26 ppm |
| 2015-11-17 | SK50588-01_01 | 1.16 ppm |
| 2015-12-08 | SL50250-01_01 | 0.928 ppm |
| 2016-01-12 | 16A0309-02_01 | 1.25 ppm |
| 2016-01-12 | 16A0309-01_01 | 0.164 ppm |
| 2016-02-09 | 16B0341-02_01 | 0.911 ppm |
| 2016-03-08 | 16C0240-02_01 | 0.671 ppm |
| 2016-04-12 | 16D0260-02_01 | 0.242 ppm |
| 2016-05-10 | 16E0365-02_01 | 1.50 ppm |
| 2016-06-21 | 16F0995-02_01 | 0.294 ppm |
| 2016-07-12 | 16G0384-02_01 | 0.239 ppm |
| 2016-08-16 | 16H0792-02_01 | 0.865 ppm |
| 2016-09-13 | 16I0461-02_01 | 1.18 ppm |
| 2016-10-19 | 16J0776-02_01 | 0.850 ppm |
| 2016-11-08 | 16K0232-02_01 | 0.991 ppm |
| 2016-12-06 | 16L0136-02_01 | 1.04 ppm |
| 2017-01-17 | 17A0478-02_01 | 1.12 ppm |
| 2017-02-07 | 17B0145-02_01 | 1.21 ppm |
| 2017-03-07 | 17C0197-02_01 | 0.836 ppm |
| 2017-04-11 | 17D0352-02_01 | 1.08 ppm |
| 2017-05-16 | 17E0632-02_01 | 1.04 ppm |
| 2017-06-20 | 17F0910-02_01 | 1.14 ppm |
| 2017-07-25 | 17G1039-01_01 | 0.797 ppm |
| 2017-08-15 | 17H0931-02_01 | 1.26 ppm |
| 2017-09-12 | 17I0302-02_01 | 1.54 ppm |
| 2017-10-10 | 17J0317-01_01 | 0.218 ppm |
| 2017-10-10 | 17J0317-02_01 | 0.956 ppm |
| 2017-11-07 | 17K0193-02_01 | 0.584 ppm |
| 2017-12-05 | 17L0088-02_01 | 1.42 ppm |
| 2018-01-09 | 18A0124-01_01 | 0.191 ppm |
| 2018-02-13 | 18B0304-01_01 | 0.274 ppm |
| 2018-02-13 | 18B0305-01_01 | 0.635 ppm |
| 2018-03-06 | 18C0140-01_01 | 0.233 ppm |
| 2018-03-06 | 18C0140-02_01 | 0.836 ppm |
| 2018-04-10 | 18D0235-01_01 | 0.804 ppm |
| 2018-04-10 | 18D0235-02_01 | 0.237 ppm |
| 2018-04-10 | 18D0235-03_01 | 0.252 ppm |
| 2018-05-15 | 18E0644-01_01 | 1.01 ppm |
| 2018-05-15 | 18E0644-02_01 | 0.280 ppm |
| 2018-06-05 | 18F0170-01 | 1.06 ppm |
| 2018-06-05 | 18F0170-02 | 0.250 ppm |
| 2018-07-10 | 18G0289-01 | 0.280 ppm |
| 2018-07-10 | 18G0293-01 | 0.270 ppm |
| 2018-07-10 | 18G0293-02 | 1.08 ppm |
| 2018-08-14 | 18H0730-01_01 | 0.285 ppm |
| 2018-08-14 | 18H0730-02_01 | 1.09 ppm |
| 2018-09-11 | 18I0334-01 | 0.240 ppm |
| 2018-09-11 | 18I0334-02 | 0.950 ppm |
| 2018-10-16 | 18J0536-01_01 | 1.91 ppm |
| 2018-10-16 | 18J0536-02_01 | 0.292 ppm |
| 2018-10-16 | 18J0536-03_01 | 0.299 ppm |
| 2018-11-06 | 18K0149-01_01 | 0.279 ppm |
| 2018-11-06 | 18K0149-02_01 | 0.929 ppm |
| 2018-12-04 | 18L0079-01_01 | 0.331 ppm |
| 2018-12-04 | 18L0079-02_01 | 0.959 ppm |
| 2019-01-08 | 19A0130-01_01 | 0.220 ppm |
| 2019-01-08 | 19A0131-01_01 | 0.829 ppm |
| 2019-01-08 | 19A0135-01_01 | 0.243 ppm |
| 2019-02-12 | 19B0217-01 | 0.260 ppm |
| 2019-02-12 | 19B0217-02 | 0.980 ppm |
| 2019-03-05 | 19C0097-01 | 0.180 ppm |
| 2019-03-05 | 19C0097-02 | 1.05 ppm |
| 2019-04-16 | 19D0375-01 | 0.220 ppm |
| 2019-04-16 | 19D0375-02 | 0.230 ppm |
| 2019-04-16 | 19D0375-03 | 0.970 ppm |
| 2019-05-21 | 19E0710-01 | 0.300 ppm |
| 2019-05-21 | 19E0710-02 | 1.19 ppm |
| 2019-06-11 | 19F0316-01 | 0.460 ppm |
| 2019-06-11 | 19F0316-02 | 0.250 ppm |
| 2019-07-22 | 19G0692-01 | 0.270 ppm |
| 2019-07-22 | 19G0692-02 | 1.01 ppm |
| 2019-08-06 | 19H0246-01 | 0.300 ppm |
| 2019-08-06 | 19H0246-02 | 1.18 ppm |
| 2019-08-06 | 19H0246-03 | 0.300 ppm |
| 2019-09-10 | 19I0359-01 | 0.230 ppm |
| 2019-09-10 | 19I0359-02 | 1.11 ppm |
| 2019-10-08 | 19J0372-01 | 0.240 ppm |
| 2019-10-08 | 19J0372-02 | 1.37 ppm |
| 2019-11-12 | 19K0315-01 | 0.260 ppm |
| 2019-11-12 | 19K0315-02 | 1.15 ppm |