Know Your Environment. Protect Your Health.

Nitrate

Sierra East Hoa

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.

 

15

Samples

0

Samples exceeding legal limit (MCL)

11

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
20190.375 ppm220.170 ppm - 0.580 ppm
20200.255 ppm220.140 ppm - 0.370 ppm
20210.260 ppm220.220 ppm - 0.300 ppm
20220.183 ppm440.130 ppm - 0.250 ppm
20230.273 ppm440.170 ppm - 0.400 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
2018-12-18CA2600622_001_001-201812181615ND
2019-06-10CA2600622_001_001-2019061012450.580 ppm
2019-06-10CA2600622_002_002-2019061012450.170 ppm
2020-03-10CA2600622_001_001-2020031012150.370 ppm
2020-03-10CA2600622_002_002-2020031012450.140 ppm
2021-03-14CA2600622_001_001-2021031410000.300 ppm
2021-03-14CA2600622_002_002-2021031410150.220 ppm
2022-03-16CA2600622_001_001-2022031608350.220 ppm
2022-03-16CA2600622_002_002-2022031608400.130 ppm
2022-03-28CA2600622_002_002-2022032807150.130 ppm
2022-03-28CA2600622_001_001-2022032807100.250 ppm
2023-06-13CA2600622_001_001-2023061309300.280 ppm
2023-06-13CA2600622_002_002-2023061310000.240 ppm
2023-07-25CA2600622_001_001-2023072509400.170 ppm
2023-07-25CA2600622_002_002-2023072509500.400 ppm