THORNTON CITY OF
Thornton, CO · 226,465 served
THORNTON CITY OF serves 226,465 people in Thornton, CO. It has 0 health-based violations in the last 5 years. TapGraded gives this system a C.
Score breakdown
Health-based violations (5y)
0
Monitoring violations (5y)
7
Currently unaddressed
0
Overall score
70/100
Violation history (last 5 years)
Get alerted when THORNTON CITY OF gets a violation
We'll only email you about this water system. Unsubscribe anytime.
Lead (Lead and Copper Rule)
EPA's current lead action level is 15 ppb (dropping to 10 ppb in 2027 under the Lead and Copper Rule Improvements).
PFAS (UCMR5 occurrence data)
System details
- System type
- Community water system
- Water source
- Surface water
- Ownership
- Local government
- Service connections
- 42,530
Worried about what's in your tap?
See which water filters are certified to remove the contaminants found in your area.
Find a filter that matches your waterFrequently asked questions
Is Thornton, CO tap water safe to drink?
THORNTON CITY OF has 0 health-based violations in the last 5 years. TapGraded gives this system a C.
Does THORNTON CITY OF have lead in its water?
The most recent 90th-percentile lead sample is 2.3 ppb, versus the EPA action level of 15 ppb.
Has PFAS been detected in THORNTON CITY OF's water?
Yes — PFAS was detected at or above the EPA MCL for 2 of the tracked analytes.
Source: EPA SDWIS/ECHO · Data as of 2026Q2