Know Your Environment. Protect Your Health.

Nitrate and nitrite

Cisco

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.

 

110

Samples

0

Samples exceeding legal limit (MCL)

110

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.37 ppm440.729 ppm - 1.79 ppm
20191.20 ppm880.500 ppm - 2.01 ppm
20201.05 ppm17170.580 ppm - 2.14 ppm
20210.904 ppm25250.260 ppm - 1.78 ppm
20221.23 ppm29290.260 ppm - 2.24 ppm
20231.66 ppm27270.610 ppm - 2.39 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

ppm = parts per million

All test results

Date Lab ID Result
2018-02-0518B0142-01_010.729 ppm
2018-05-2218E0962-011.79 ppm
2018-09-0518I0108-011.77 ppm
2018-11-1418K0442-01_011.20 ppm
2019-02-2019B0402-011.56 ppm
2019-05-2019E0649-011.48 ppm
2019-09-1819I0761-012.01 ppm
2019-10-2819J0974-011.32 ppm
2019-10-2819J0974-021.20 ppm
2019-11-2019K0604-010.530 ppm
2019-11-2019K0604-020.970 ppm
2019-12-1819L0453-010.500 ppm
2020-01-2020A0413-010.580 ppm
2020-01-2020A0413-020.870 ppm
2020-02-2420B0563-010.610 ppm
2020-02-2420B0563-020.860 ppm
2020-03-1820C0500-020.880 ppm
2020-04-1420D0220-010.810 ppm
2020-04-1420D0220-021.18 ppm
2020-05-2020E0337-010.840 ppm
2020-06-1720F0344-011.04 ppm
2020-06-1720F0344-021.13 ppm
2020-09-1520I0619-011.09 ppm
2020-10-2720J0881-022.14 ppm
2020-10-2920J0937-011.27 ppm
2020-11-1720K0423-010.970 ppm
2020-11-1720K0423-021.56 ppm
2020-12-0820L0258-010.860 ppm
2020-12-0820L0258-021.24 ppm
2021-01-1921A0339-010.770 ppm
2021-01-1921A0339-021.56 ppm
2021-02-0821B0225-010.920 ppm
2021-02-0821B0225-021.17 ppm
2021-03-1021C0410-010.880 ppm
2021-03-1021C0410-021.18 ppm
2021-03-1021C0411-010.880 ppm
2021-04-1921D0512-010.820 ppm
2021-04-1921D0512-021.57 ppm
2021-05-1921E0549-010.370 ppm
2021-05-1921E0549-020.970 ppm
2021-06-1421F0506-010.260 ppm
2021-06-1421F0506-021.10 ppm
2021-07-1221G0389-011.22 ppm
2021-07-1221G0389-020.290 ppm
2021-08-1621H0841-010.310 ppm
2021-08-1621H0841-021.42 ppm
2021-09-2021I0778-010.290 ppm
2021-09-2021I0778-021.20 ppm
2021-10-1121J0318-011.58 ppm
2021-10-1121J0318-020.330 ppm
2021-11-0821K0336-011.78 ppm
2021-11-0821K0336-020.350 ppm
2021-12-1321L0413-011.04 ppm
2021-12-1321L0413-020.340 ppm
2022-01-1122A0260-011.47 ppm
2022-01-1122A0260-020.260 ppm
2022-02-2122B0508-010.970 ppm
2022-02-2122B0508-020.300 ppm
2022-03-0922C0238-011.06 ppm
2022-03-0922C0238-020.280 ppm
2022-03-0922C0238-030.270 ppm
2022-04-2022D0524-011.22 ppm
2022-04-2022D0524-020.390 ppm
2022-05-1022E0263-011.21 ppm
2022-05-1022E0263-020.390 ppm
2022-06-2222F1206-011.05 ppm
2022-06-2222F1206-020.850 ppm
2022-07-2022G0783-012.12 ppm
2022-07-2022G0783-020.960 ppm
2022-07-2222G0875-011.72 ppm
2022-08-1722H0923-011.56 ppm
2022-08-1722H0923-021.24 ppm
2022-08-2322H1105-011.80 ppm
2022-08-2322H1105-021.36 ppm
2022-09-2122I0909-011.92 ppm
2022-09-2122I0909-021.73 ppm
2022-09-2622I1015-011.63 ppm
2022-10-1922J0941-012.00 ppm
2022-10-1922J0941-021.64 ppm
2022-11-2122K0607-011.26 ppm
2022-11-2122K0607-022.24 ppm
2022-12-0722L0191-011.83 ppm
2022-12-0722L0191-020.860 ppm
2023-01-1723A0275-012.09 ppm
2023-01-1723A0275-020.780 ppm
2023-02-1523B0512-011.56 ppm
2023-02-1523B0512-020.670 ppm
2023-02-1523B0512-030.680 ppm
2023-03-1523C0399-011.88 ppm
2023-03-1523C0399-020.610 ppm
2023-04-1923D0461-012.08 ppm
2023-04-1923D0461-020.880 ppm
2023-05-2223E0923-011.80 ppm
2023-05-2223E0923-021.25 ppm
2023-06-1923F0762-012.39 ppm
2023-06-1923F0762-021.58 ppm
2023-06-2223F0891-011.79 ppm
2023-06-2223F0891-021.70 ppm
2023-07-2023G0862-011.78 ppm
2023-07-2023G0862-021.94 ppm
2023-08-2223H1190-011.98 ppm
2023-08-2223H1190-021.79 ppm
2023-09-2523I0989-012.15 ppm
2023-09-2523I0989-021.97 ppm
2023-10-2423J0869-012.05 ppm
2023-10-2423J0869-021.67 ppm
2023-11-1523K0423-012.32 ppm
2023-11-1523K0423-021.79 ppm
2023-12-1323L0296-012.02 ppm
2023-12-1323L0296-021.53 ppm