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EWG's Tap Water Database — 2019 UPDATE

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Nitrate and nitrite

Combine Water Supply Corporation

NOTE: Combine Water Supply Corporation purchases water from City of Seagoville which is required to test for nitrate and nitrite. Sample information shown below was taken by City of Seagoville.

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.

 

3

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.870 ppm110.870 ppm
2013N/A00N/A
20141.16 ppm111.16 ppm
20150.362 ppm110.362 ppm
2016N/A00N/A
2017N/A00N/A

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

NOTE: Combine Water Supply Corporation purchases water from City of Seagoville which is required to test for nitrate and nitrite. Sample information shown below was taken by City of Seagoville.

Date Lab ID Result
2012-02-2112025860010.380 ppm
2014-10-28Q14544380030.300 ppm
2015-01-27Q15031470010.362 ppm