T

Thornton, CO

—no score

Contamination score

Higher = more contaminated vs. other cities.

⚠️2 health-based violations on record.
0
Water sources
28
Violations
0
Pollution sources
0
Self-reported
0
Lawsuits

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Reported illness & cancer claims

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Self-reported issues

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Pollution sources & reported claims near your water

Factories, greenhouses, and contaminated sites mapped around the water supply. Tap any circle for detail.

Critical High Medium Reported claim

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Public water systems

THORNTON CITY OF

PWSID:
CO0101150
Source:
Surface water
Serves:
226,465 people

The Grove At Alta Ridge

PWSID:
CO0101320
Source:
Surface water
Serves:
1,300 people

Redwood Estates

PWSID:
CO0101667
Source:
Surface water
Serves:
1,500 people

Thornton Estates

PWSID:
CO0101741
Source:
Surface water
Serves:
300 people

Chaparral Village MHP

PWSID:
CO0101078
Source:
Surface water
Serves:
303 people

Woodland Hills Mhc

PWSID:
CO0101833
Source:
Surface water
Serves:
1,740 people

Avilla Eastlake

PWSID:
CO0101126
Source:
Surface water
Serves:
410 people

EPA & DEP violations

THORNTON CITY OF

PWSID CO01011508 violations

  • Monitoring violation — THORNTON CITY OF

    low severityResolved

    EPA SDWIS violation 1135 (code 38) at THORNTON CITY OF (PWSID CO0101150).

    EPA SDWIS · Monitoring violation · Began Nov 1, 2023 · 2 years ago · Source ↗

  • Monitoring violation — THORNTON CITY OF

    low severityResolved

    EPA SDWIS violation 1134 (code 38) at THORNTON CITY OF (PWSID CO0101150).

    EPA SDWIS · Monitoring violation · Began Oct 1, 2023 · 2 years ago · Source ↗

  • Monitoring violation — THORNTON CITY OF

    low severityResolved

    EPA SDWIS violation 1133 (code 38) at THORNTON CITY OF (PWSID CO0101150).

    EPA SDWIS · Monitoring violation · Began Sep 1, 2023 · 2 years ago · Source ↗

  • Monitoring violation — THORNTON CITY OF

    low severityResolved

    EPA SDWIS violation 1132 (code 52) at THORNTON CITY OF (PWSID CO0101150).

    EPA SDWIS · Monitoring violation · Began Jul 1, 2023 · 3 years ago · Source ↗

  • Monitoring violation — THORNTON CITY OF

    low severityResolved

    EPA SDWIS violation 1127 (code 03) at THORNTON CITY OF (PWSID CO0101150).

    EPA SDWIS · Monitoring violation · Began Apr 1, 2022 · 4 years ago · Source ↗

  • Monitoring violation — THORNTON CITY OF

    low severityResolved

    EPA SDWIS violation 1128 (code 03) at THORNTON CITY OF (PWSID CO0101150).

    EPA SDWIS · Monitoring violation · Began Apr 1, 2022 · 4 years ago · Source ↗

  • Monitoring violation — THORNTON CITY OF

    low severityResolved

    EPA SDWIS violation 1129 (code 03) at THORNTON CITY OF (PWSID CO0101150).

    EPA SDWIS · Monitoring violation · Began Apr 1, 2022 · 4 years ago · Source ↗

  • Monitoring violation — THORNTON CITY OF

    low severityResolved

    EPA SDWIS violation 1061 (code 38) at THORNTON CITY OF (PWSID CO0101150).

    EPA SDWIS · Monitoring violation · Began May 1, 2021 · 5 years ago · Source ↗

City-wide

20 violations

  • Lead and Copper Rule — MR violation

    medium severityResolved

    Lead and Copper Rule MR violation (Resolved).

    EPA SDWIS · MR · Began Jan 1, 2026 · 7 months ago · Source ↗

  • Lead and Copper Rule — MR violation

    medium severityResolved

    Lead and Copper Rule MR violation (Resolved).

    EPA SDWIS · MR · Began Oct 1, 2025 · 10 months ago · Source ↗

  • Chloramine — MR violation

    medium severityResolved

    Chloramine MR violation (Resolved).

    EPA SDWIS · MR · Began Jan 1, 2024 · 2 years ago · Source ↗

  • Surface Water Treatment Rule — MR violation

    medium severityResolved

    Surface Water Treatment Rule MR violation (Resolved).

    EPA SDWIS · MR · Began Jan 1, 2024 · 2 years ago · Source ↗

  • Lead and Copper Rule — MR violation

    medium severityResolved

    Lead and Copper Rule MR violation (Resolved).

    EPA SDWIS · MR · Began Oct 1, 2023 · 2 years ago · Source ↗

  • Lead and Copper Rule — MR violation

    medium severityResolved

    Lead and Copper Rule MR violation (Resolved).

    EPA SDWIS · MR · Began Jul 1, 2023 · 3 years ago · Source ↗

  • TTHM — MR violation

    medium severityResolved

    TTHM MR violation (Resolved).

    EPA SDWIS · MR · Began Jan 1, 2023 · 3 years ago · Source ↗

  • Total Haloacetic Acids (HAA5) — MR violation

    medium severityResolved

    Total Haloacetic Acids (HAA5) MR violation (Resolved).

    EPA SDWIS · MR · Began Jan 1, 2023 · 3 years ago · Source ↗

  • Lead and Copper Rule — MR violation

    medium severityResolved

    Lead and Copper Rule MR violation (Resolved).

    EPA SDWIS · MR · Began Jan 1, 2023 · 3 years ago · Source ↗

  • Revised Total Coliform Rule — Other violation

    medium severityResolved

    Revised Total Coliform Rule Other violation (Resolved).

    EPA SDWIS · Other · Began Oct 11, 2022 · 3 years ago · Source ↗

  • Stage 2 Disinfectants and Disinfection Byproducts Rule — MR violation

    medium severityResolved

    Stage 2 Disinfectants and Disinfection Byproducts Rule MR violation (Resolved).

    EPA SDWIS · MR · Began Oct 11, 2022 · 3 years ago · Source ↗

  • Revised Total Coliform Rule — Other violation

    medium severityResolved

    Revised Total Coliform Rule Other violation (Resolved).

    EPA SDWIS · Other · Began Oct 11, 2022 · 3 years ago · Source ↗

  • Stage 2 Disinfectants and Disinfection Byproducts Rule — MR violation

    medium severityResolved

    Stage 2 Disinfectants and Disinfection Byproducts Rule MR violation (Resolved).

    EPA SDWIS · MR · Began Oct 11, 2022 · 3 years ago · Source ↗

  • Public Notice — Other violation

    medium severityResolved

    Public Notice Other violation (Resolved).

    EPA SDWIS · Other · Began Sep 9, 2022 · 3 years ago · Source ↗

  • Public Notice — Other violation

    medium severityResolved

    Public Notice Other violation (Resolved).

    EPA SDWIS · Other · Began Sep 9, 2022 · 3 years ago · Source ↗

  • Surface Water Treatment Rule — MR violation

    medium severityResolved

    Surface Water Treatment Rule MR violation (Resolved).

    EPA SDWIS · MR · Began Sep 1, 2022 · 3 years ago · Source ↗

  • Surface Water Treatment Rule — MR violation

    medium severityResolved

    Surface Water Treatment Rule MR violation (Resolved).

    EPA SDWIS · MR · Began Sep 1, 2022 · 3 years ago · Source ↗

  • Stage 1 Disinfectants and Disinfection Byproducts Rule — TT violation

    high severityHealth-basedResolved

    Stage 1 Disinfectants and Disinfection Byproducts Rule TT violation (Resolved).

    EPA SDWIS · TT · Began Aug 6, 2022 · 4 years ago · Source ↗

  • Stage 1 Disinfectants and Disinfection Byproducts Rule — TT violation

    high severityHealth-basedResolved

    Stage 1 Disinfectants and Disinfection Byproducts Rule TT violation (Resolved).

    EPA SDWIS · TT · Began Aug 6, 2022 · 4 years ago · Source ↗

  • Revised Total Coliform Rule — MON violation

    medium severityResolved

    Revised Total Coliform Rule MON violation (Resolved).

    EPA SDWIS · MON · Began Aug 1, 2022 · 4 years ago · Source ↗

Water-related lawsuits

No lawsuits on record.

In the news & sources

No coverage linked yet.