EWG's Tap Water Database — 2021 UPDATE



Marco Island Utilities

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.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20140.0825 ppm440.0700 ppm - 0.0900 ppm
20150.0567 ppm32ND - 0.120 ppm
20160.0450 ppm220.01000 ppm - 0.0800 ppm
20170.108 ppm43ND - 0.200 ppm
20180.130 ppm330.0660 ppm - 0.250 ppm
20190.167 ppm330.103 ppm - 0.223 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The EWG Health Guideline of 0.14 ppm for nitrate was defined by EWG . This health guideline protects against cancer and harm to fetal growth and development.

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 Result
2014-03-180.0700 ppm
2014-03-180.0900 ppm
2014-04-240.0900 ppm
2014-10-130.0800 ppm
2015-03-160.120 ppm
2015-04-070.0500 ppm
2016-04-210.01000 ppm
2016-10-110.0800 ppm
2017-04-040.120 ppm
2017-04-040.110 ppm
2017-11-060.200 ppm
2018-04-110.0730 ppm
2018-04-230.0660 ppm
2018-11-070.250 ppm
2019-04-300.174 ppm
2019-05-010.103 ppm
2019-11-040.223 ppm