Is Thornton tap water safe to drink?

Yes with good quality

Thornton's tap water meets all EPA standards and scores well on our analysis. It is generally safe to drink though filtration can improve taste and provide extra precaution.

85/100
Purity Score
1
Issues Found
2.2 GPG
Hardness
Not detected
PFAS

1 Issue Detected in Thornton

Arsenic Approaching Limit (0.1 mg/L)

EPA limit is 0.010 mg/L.

Arsenic info for Thornton
Colorado

802,298,023,380,241 · South Platte River and CBT system

Thornton Water Quality Report (2026)

Low Risk Updated March 2026 136,208 residents
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85
Purity Score

Water quality in Thornton, Colorado is evaluated here using public utility data and independent testing. The report includes a purity score, contaminant breakdown, and tailored filter recommendations.

Contaminant Levels

PFAS
ND
Lead
1.5 ppb
Nitrate
0.3 mg/L
Arsenic
0.1 mg/L
Hardness
2.2 gpg

Health Insights

  • 1
    Thornton's water meets current EPA standards. Filtration can improve taste and provide extra safety.

Score

85 /100
Excellent
"Good" threshold (70)

Thornton tap water is sourced from South Platte River and CBT system and treated by City of Thornton Water. Overall purity score: 85/100 (Excellent). Updated for 2026.

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Best filters matched to Thornton's 1 issue.

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Explore Thornton Water Data

PFAS Levels in ThorntonPFAS testing data
Thornton Lead LevelsLead testing data
Water Hardness in ThorntonHardness levels
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Thornton Water FAQ

Is Thornton CO tap water safe to drink in 2026?
Thornton tap water meets EPA federal drinking water standards and scores 85/100 (Excellent) on PurityMap for 2026. For most healthy adults the water is considered safe but point-of-use filtration adds an important layer of protection.
Does Thornton CO use chlorine or chloramine for disinfection?
Thornton uses chloramine as the primary disinfectant with a residual level of 0.9 ppm. Chloramine is harder to remove than free chlorine and requires a catalytic carbon or reverse osmosis filter. Standard Brita-style pitchers will NOT remove chloramine.
How hard is Thornton CO water and what is the TDS level?
Thornton water hardness is 2.2 grains per gallon (soft) with a TDS of 60 ppm (good). This level is unlikely to cause significant scale buildup in household plumbing.
Has PFAS been found in Thornton CO drinking water?
Based on available EPA UCMR5 monitoring data as of 2026 PFAS have not been detected above EPA advisory levels in Thornton drinking water.
What is the best water filter for Thornton?
Based on Thornton's water profile, we recommend the Clearly Filtered Water Pitcher. Thornton water scores well overall. A pitcher filter provides extra precaution and improves taste for drinking and cooking.

Nearby Reports

Colorado SpringsColorado — 70/100PuebloColorado — 82/100GreeleyColorado — 85/100DenverColorado — 85/100AuroraColorado — 85/100Fort CollinsColorado — 85/100

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Data Sources

  • EPA SDWIS
  • EWG Tap Water Database
  • City of Thornton Water CCR
  • USGS monitoring data

PurityMap compiles public data. Updated March 2026.

© 2026 PurityMap. For informational purposes only.

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