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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

Columbus Public Water System

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.

MORE ABOUT THIS CONTAMINANT

 

176

Samples

12

Samples exceeding legal limit (MCL)

151

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.27 ppm2519ND - 3.30 ppm
20154.81 ppm4641ND - 12.5 ppm
20163.67 ppm3229ND - 10.6 ppm
20172.14 ppm2723ND - 7.60 ppm
20181.86 ppm2522ND - 6.20 ppm
20191.36 ppm2117ND - 3.60 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
2014-01-082014-28095-NUTND
2014-01-132014-28134-NUT0.800 ppm
2014-01-132014-28136-NUT3.30 ppm
2014-02-032014-28642-NUT1.10 ppm
2014-02-032014-28644-NUT3.10 ppm
2014-03-032014-29316-NUT1.10 ppm
2014-03-032014-29318-NUT2.10 ppm
2014-04-022014-30198-NUT1.10 ppm
2014-04-022014-30200-NUT2.80 ppm
2014-05-052014-31121-NUT1.10 ppm
2014-05-052014-31123-NUT3.30 ppm
2014-06-022014-31794-NUT1.000 ppm
2014-06-022014-31796-NUT2.70 ppm
2014-07-072014-32893-NUT1.30 ppm
2014-07-072014-32895-NUT3.00 ppm
2014-08-012014-33566-NUT1.20 ppm
2014-08-012014-33568-NUT0.900 ppm
2014-09-082014-34668-NUT0.800 ppm
2014-09-082014-34670-NUTND
2014-10-062014-35502-NUTND
2014-10-062014-35504-NUTND
2014-11-032014-36421-NUT0.500 ppm
2014-11-032014-36423-NUTND
2014-12-012014-37237-NUTND
2014-12-012014-37239-NUT0.500 ppm
2015-01-072015-38123-NUT0.500 ppm
2015-01-072015-38125-NUT2.10 ppm
2015-01-072015-38127-NUTND
2015-02-032015-38783-NUT1.10 ppm
2015-02-032015-38785-NUT2.90 ppm
2015-03-022015-39455-NUT1.10 ppm
2015-03-022015-39457-NUT3.00 ppm
2015-04-062015-40406-NUT1.000 ppm
2015-04-072015-40408-NUT4.60 ppm
2015-05-042015-41190-NUT1.10 ppm
2015-05-042015-41192-NUT2.20 ppm
2015-06-012015-42104-NUT1.10 ppm
2015-06-012015-42106-NUT1.20 ppm
2015-06-022015-42085-NUT2.50 ppm
2015-06-032015-42240-NUT3.70 ppm
2015-06-042015-42237-NUT6.20 ppm
2015-06-052015-42258-NUT7.70 ppm
2015-06-062015-42283-NUT8.70 ppm
2015-06-072015-42298-NUT9.50 ppm
2015-06-082015-42311-NUT10.8 ppm
2015-06-092015-42360-NUT11.7 ppm
2015-06-102015-42419-NUT11.7 ppm
2015-06-112015-42523-NUT11.4 ppm
2015-06-122015-42572-NUT11.8 ppm
2015-06-132015-42582-NUT12.5 ppm
2015-06-142015-42584-NUT12.0 ppm
2015-06-152015-42586-NUT10.7 ppm
2015-06-162015-42666-NUT10.6 ppm
2015-06-172015-42708-NUT10.00 ppm
2015-06-182015-42800-NUT9.00 ppm
2015-06-192015-42838-NUT9.40 ppm
2015-06-202015-42848-NUT7.80 ppm
2015-06-212015-42850-NUT5.20 ppm
2015-06-222015-42852-NUT4.90 ppm
2015-07-062015-43261-NUT1.70 ppm
2015-07-062015-43263-NUT3.00 ppm
2015-08-032015-44221-NUT1.60 ppm
2015-08-042015-44219-NUT0.600 ppm
2015-09-082015-45106-NUT1.000 ppm
2015-09-082015-45108-NUTND
2015-10-052015-45856-NUTND
2015-10-052015-45858-NUTND
2015-11-022015-46634-NUT0.500 ppm
2015-11-022015-46636-NUTND
2015-12-072015-47633-NUT0.700 ppm
2015-12-072015-47635-NUT2.40 ppm
2016-01-042016-48386-NUTND
2016-01-052016-48382-NUT0.700 ppm
2016-01-052016-48384-NUT6.40 ppm
2016-02-022016-49117-NUT1.000 ppm
2016-02-022016-49119-NUT5.10 ppm
2016-03-072016-50032-NUT1.30 ppm
2016-03-072016-50034-NUT5.80 ppm
2016-04-042016-50869-NUT1.50 ppm
2016-04-042016-50871-NUT2.70 ppm
2016-05-032016-51803-NUT1.10 ppm
2016-05-032016-51805-NUT2.50 ppm
2016-06-062016-52808-NUT1.000 ppm
2016-06-062016-52810-NUT2.50 ppm
2016-06-262016-53424-NUT6.80 ppm
2016-06-272016-53426-NUT8.90 ppm
2016-06-282016-53535-NUT9.30 ppm
2016-06-292016-53542-NUT10.3 ppm
2016-07-012016-53635-NUT10.6 ppm
2016-07-012016-53637-NUT10.6 ppm
2016-07-052016-53726-NUT0.700 ppm
2016-07-052016-53728-NUT9.00 ppm
2016-07-052016-53677-NUT8.90 ppm
2016-08-012016-54638-NUT0.800 ppm
2016-08-012016-54640-NUT2.30 ppm
2016-09-062016-55835-NUT1.10 ppm
2016-09-062016-55837-NUTND
2016-10-032016-56681-NUT0.800 ppm
2016-10-032016-56683-NUTND
2016-11-012016-57670-NUT0.700 ppm
2016-11-012016-57672-NUT1.90 ppm
2016-12-052016-58595-NUT0.900 ppm
2016-12-052016-58597-NUT2.10 ppm
2017-01-092017-59632-NUTND
2017-01-102017-59630-NUT6.80 ppm
2017-01-102017-59628-NUT1.000 ppm
2017-02-062017-60393-NUT5.10 ppm
2017-02-062017-60391-NUT1.50 ppm
2017-03-062017-61264-NUT3.00 ppm
2017-03-062017-61262-NUT1.80 ppm
2017-04-032017-62113-NUT2.90 ppm
2017-04-032017-62111-NUT1.90 ppm
2017-05-012017-62933-NUT2.60 ppm
2017-05-012017-62931-NUT1.30 ppm
2017-06-052017-64014-NUT7.60 ppm
2017-06-052017-64012-NUT1.40 ppm
2017-07-102017-65312-NUT7.00 ppm
2017-07-102017-65310-NUT1.30 ppm
2017-08-072017-66199-NUT1.30 ppm
2017-08-072017-66197-NUT1.000 ppm
2017-09-052017-66994-NUTND
2017-09-052017-66992-NUT0.700 ppm
2017-10-022017-67765-NUTND
2017-10-022017-67763-NUT0.500 ppm
2017-11-062017-68796-NUT0.700 ppm
2017-11-062017-68794-NUTND
2017-12-042017-69544-NUT3.90 ppm
2017-12-042017-69542-NUT0.600 ppm
2017-12-2017-34228-013.28 ppm
2017-12-2017-34228-020.720 ppm
2018-01-032018-70477-NUTND
2018-01-042018-70475-NUT2.80 ppm
2018-01-042018-70473-NUT0.800 ppm
2018-02-052018-71245-NUT5.30 ppm
2018-02-052018-71243-NUT1.20 ppm
2018-03-052018-72117-NUT1.70 ppm
2018-03-052018-72115-NUT1.80 ppm
2018-04-022018-73598-NUT2.40 ppm
2018-04-022018-73596-NUT1.60 ppm
2018-05-072018-75343-NUT2.50 ppm
2018-05-072018-75341-NUT1.000 ppm
2018-06-042018-76823-NUT5.50 ppm
2018-06-042018-76821-NUT1.000 ppm
2018-07-022018-78543-NUT6.20 ppm
2018-07-022018-78541-NUT1.000 ppm
2018-08-062018-80525-NUT1.20 ppm
2018-08-062018-80523-NUT0.700 ppm
2018-09-042018-82163-NUTND
2018-09-042018-82161-NUTND
2018-10-012018-83648-NUT1.70 ppm
2018-10-012018-83646-NUT0.700 ppm
2018-11-052018-85340-NUT3.30 ppm
2018-11-052018-85338-NUT0.700 ppm
2018-12-032018-86420-NUT2.70 ppm
2018-12-032018-86418-NUT0.800 ppm
2019-01-072019-87602-NUT2.20 ppm
2019-01-072019-87600-NUT1.30 ppm
2019-01-072019-87608-NUTND
2019-02-042019-88557-NUT3.40 ppm
2019-02-042019-88555-NUT1.20 ppm
2019-03-042019-89768-NUT3.20 ppm
2019-03-042019-89766-NUT1.20 ppm
2019-04-012019-91119-NUT2.20 ppm
2019-04-012019-91117-NUT1.10 ppm
2019-05-062019-92839-NUT2.00 ppm
2019-05-062019-92837-NUT0.900 ppm
2019-06-032019-94281-NUT2.10 ppm
2019-06-032019-94279-NUT0.900 ppm
2019-07-082019-95690-NUT3.60 ppm
2019-07-082019-95688-NUT1.10 ppm
2019-08-052019-97329-NUT0.600 ppm
2019-08-052019-97327-NUT1.000 ppm
2019-09-032019-98995-NUTND
2019-09-032019-98993-NUT0.600 ppm
2019-10-072019-100856-NUTND
2019-10-072019-100854-NUTND