Thornton Tap Water Quality Report
Thornton's water has 6 contaminants above EPA MCLGs. We recommend using a certified water filter.
Utility
THORNTON WATER SYSTEM
People Served
22,500
MCL Violations
0
Last Updated
Is Thornton Tap Water Safe to Drink?
Thornton's water has 6 contaminants above EPA health-based guidelines. We strongly recommend using a certified water filter to reduce exposure to these contaminants. Check our filter recommendations below for NSF-certified options that can remove the specific contaminants found in Thornton's water.
The data below shows test results from 1 water utility serving 22,500 people in the Thornton area. Water quality testing is conducted regularly and reported to the EPA. This report was last updated May 17, 2022.
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in Illinois
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With 6 contaminants above EPA health guidelines, independent laboratory testing provides a second opinion and can track changes over time.

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With 6 contaminants above health guidelines, you may want to explore water purification options. Learn how to make distilled water at home for applications like humidifiers, CPAP machines, and baby formula.
What Thornton's water readings can explain
Utility-reported data for Thornton includes sulfate โ the readings behind these common tap water questions. We publish a city-level hardness figure for Thornton, resolved from its water systems where they report one and estimated from county sampling where they do not. Each page starts with the hot-tap and cold-tap check, then shows what your own water system reported.
What a water softener costs for Thornton's water
Thornton's tap water measures 8.2 grains per gallon (140.0 mg/L) โ hard on the USGS scale, the range where scale on fixtures and appliances is the usual complaint.
Water softener cost for 8.2 gpg water in Thornton โ equipment and local installation labour for your ZIP code, with the sizing arithmetic shown in full.
Frequently Asked Questions About Thornton Tap Water
Thornton's water has 6 contaminants above EPA MCLGs. We strongly recommend using a certified water filter to reduce exposure to these contaminants. Check our filter recommendations below for NSF-certified options that can remove the specific contaminants found in Thornton's water.
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