City water profile

Water hardness in Thornton

Find official utility reports, understand hardness, and check the water system serving your home in Thornton, Colorado.

Utility-reported hardness

Not yet available

Check your provider and source →

State comparison: Unavailable
Evidence comparison rank: —
Matched utilities: 7
Active health records: 0

Your tap water

What does the utility report?

Match the utility name to your water bill. These results describe the utility’s water, not a test at your home. A ZIP can include several water systems.

Utility hardness unavailable in this index

Nearby river or groundwater samples cannot tell us the hardness coming out of your tap. Ask your water provider for total hardness as CaCO₃, or test it at home.

Find an official utility report →

Convert a hardness result →Test your tap →

Match the name on your water bill

Your utility’s measurements and compliance records

These are possible serving systems. A record for one system does not apply to every home in this ZIP. Confirm your provider before interpreting a measurement or notice. Federal records can lag current utility notices.

EPA snapshot: 2026Q2. Historical window begins Jan 1, 2021.

Thornton City Of

CO0101150 · Surface water · 226,465 people served system-wide

A municipal system, in-state city, and served county all agree with this Census ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0.0023 mg/L
Action level: 0.015 mg/L

15% of the listed benchmark

Monitoring period: Jan 1, 2025 to Dec 31, 2025

Violation history (8)

Imported violation history for Thornton City Of
Rule	Status	Period
Interim Enhanced Surface Water Treatment Rule	Resolved	Nov 1, 2023 to Nov 30, 2023
Interim Enhanced Surface Water Treatment Rule	Resolved	Oct 1, 2023 to Oct 31, 2023
Interim Enhanced Surface Water Treatment Rule	Resolved	Sep 1, 2023 to Sep 30, 2023
Lead and Copper Rule	Resolved	Jul 1, 2023 to Dec 29, 2023
Combined Radium (-226 and -228)	Resolved	Apr 1, 2022 to Jun 30, 2022
Combined Uranium	Resolved	Apr 1, 2022 to Jun 30, 2022
Gross Alpha, Excl. Radon and U	Resolved	Apr 1, 2022 to Jun 30, 2022
Interim Enhanced Surface Water Treatment Rule	Resolved	May 1, 2021 to May 31, 2021

Woodland Hills Mhc

CO0101833 · Surface water · 1,740 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0.003 mg/L
Action level: 0.015 mg/L

20% of the listed benchmark

Monitoring period: Jan 1, 2023 to Dec 31, 2025

Violation history (2)

Imported violation history for Woodland Hills Mhc
Rule	Status	Period
Chloramine	Resolved	Apr 1, 2022 to May 17, 2022
Surface Water Treatment Rule	Resolved	Apr 1, 2022 to Apr 30, 2022

Redwood Estates

CO0101667 · Surface water · 1,500 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0 mg/L
Action level: 0.015 mg/L

0% of the listed benchmark

Monitoring period: Jan 1, 2025 to Dec 31, 2025

Violation history (0)

No record returned in this imported window. This is not a guarantee of tap-water safety.

The Grove At Alta Ridge

CO0101320 · Surface water · 1,300 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0 mg/L
Action level: 0.015 mg/L

0% of the listed benchmark

Monitoring period: Jul 1, 2023 to Dec 31, 2023

Violation history (15)

Imported violation history for The Grove At Alta Ridge
Rule	Status	Period
Revised Total Coliform Rule	Resolved	Oct 11, 2022 to Nov 27, 2022
Stage 2 Disinfectants and Disinfection Byproducts Rule	Resolved	Oct 11, 2022 to Nov 27, 2022
Public Notice	Resolved	Sep 9, 2022 to Oct 8, 2022
Surface Water Treatment Rule	Resolved	Sep 1, 2022 to Sep 30, 2022
Stage 1 Disinfectants and Disinfection Byproducts RuleHealth-based	Resolved	Aug 6, 2022 to Sep 6, 2022
Revised Total Coliform Rule	Resolved	Aug 1, 2022 to Aug 31, 2022
Surface Water Treatment Rule	Resolved	Aug 1, 2022 to Aug 31, 2022
TTHM	Resolved	Jul 1, 2022 to Sep 30, 2022
Chloramine	Resolved	Jul 1, 2022 to Sep 30, 2022
Revised Total Coliform Rule	Resolved	Jul 1, 2022 to Jul 31, 2022
Surface Water Treatment Rule	Resolved	Jul 1, 2022 to Jul 31, 2022
Total Haloacetic Acids (HAA5)	Resolved	Jul 1, 2022 to Sep 30, 2022
Revised Total Coliform Rule	Resolved	Jun 1, 2022 to Jun 30, 2022
Surface Water Treatment Rule	Resolved	Jun 1, 2022 to Jun 30, 2022
Chloramine	Resolved	Apr 1, 2022 to Jun 30, 2022

Avilla Eastlake

CO0101126 · Surface water · 410 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0 mg/L
Action level: 0.015 mg/L

0% of the listed benchmark

Monitoring period: Jan 1, 2024 to Jun 30, 2024

Violation history (22)

Imported violation history for Avilla Eastlake
Rule	Status	Period
Chloramine	Resolved	Jan 1, 2024 to Feb 26, 2024
Surface Water Treatment Rule	Resolved	Jan 1, 2024 to Jan 31, 2024
Lead and Copper Rule	Resolved	Oct 1, 2023 to Nov 6, 2023
Lead and Copper Rule	Resolved	Jul 1, 2023 to Jul 8, 2024
TTHM	Resolved	Jan 1, 2023 to Dec 31, 2023
Total Haloacetic Acids (HAA5)	Resolved	Jan 1, 2023 to Dec 31, 2023
Lead and Copper Rule	Resolved	Jan 1, 2023 to Jul 8, 2024
Revised Total Coliform Rule	Resolved	Oct 11, 2022 to Oct 31, 2023
Stage 2 Disinfectants and Disinfection Byproducts Rule	Resolved	Oct 11, 2022 to Oct 31, 2023
Public Notice	Resolved	Sep 9, 2022 to Nov 1, 2022
Surface Water Treatment Rule	Resolved	Sep 1, 2022 to Sep 30, 2022
Stage 1 Disinfectants and Disinfection Byproducts RuleHealth-based	Resolved	Aug 6, 2022 to Oct 3, 2022
Surface Water Treatment Rule	Resolved	Aug 1, 2022 to Aug 31, 2022
Revised Total Coliform Rule	Resolved	Aug 1, 2022 to Aug 31, 2022
Revised Total Coliform Rule	Resolved	Jul 1, 2022 to Jul 31, 2022
Surface Water Treatment Rule	Resolved	Jul 1, 2022 to Jul 31, 2022
Chloramine	Resolved	Jul 1, 2022 to Sep 30, 2022
Surface Water Treatment Rule	Resolved	Jun 1, 2022 to Jun 30, 2022
Revised Total Coliform Rule	Resolved	Jun 1, 2022 to Jun 30, 2022
Chloramine	Resolved	Apr 1, 2022 to Jun 30, 2022
TTHM	Resolved	Jan 1, 2022 to Aug 31, 2022
Total Haloacetic Acids (HAA5)	Resolved	Jan 1, 2022 to Aug 31, 2022

Chaparral Village Mhp

CO0101078 · Surface water · 303 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0 mg/L
Action level: 0.015 mg/L

0% of the listed benchmark

Monitoring period: Jul 1, 2025 to Dec 31, 2025

Violation history (1)

Imported violation history for Chaparral Village Mhp
Rule	Status	Period
Lead and Copper Rule	Resolved	Oct 1, 2025 to Oct 2, 2025

Thornton Estates

CO0101741 · Surface water · 300 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0 mg/L
Action level: 0.015 mg/L

0% of the listed benchmark

Monitoring period: Jan 1, 2025 to Dec 31, 2025

Violation history (1)

Imported violation history for Thornton Estates
Rule	Status	Period
Lead and Copper Rule	Resolved	Jan 1, 2026 to Apr 16, 2026

City summary

What the indexed records say

Thornton has 5 published ZIP profiles across Adams County. The regional-evidence median is 349 PPM. The city does not meet the stricter comparison standard.

The 349–349 PPM range shows how much the available ZIP estimates vary within the city label. At least one estimate is marked low confidence, so observation distance and date deserve extra attention.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs

Moderately hard0 ZIPs

Hard0 ZIPs

Very hard5 ZIPs

5 of 5 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance: 11.1 miles
Profiles with evidence: 5/5

Confidence labels

High: 0Moderate: 0Low: 5

1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
3. Use a measured hardness result. Confirm health concerns or treatment sizing with the right method.

Continue comparing

Other Colorado communities

Brighton

Adams County

349 PPM median

Westminster

Adams County

349 PPM median

Arvada

Jefferson County

349 PPM median

Aurora

Arapahoe County

349 PPM median

Broomfield

Broomfield County

349 PPM median

Englewood

Arapahoe County

349 PPM median

Search all 58 Colorado cities →

Questions people ask

About water in Thornton

Is the water hard?

Check the utility-reported result above when available. Nearby environmental samples cannot establish tap-water hardness. Ask your provider or test your tap.

Is the tap water safe?

Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.

Do I need treatment?

Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.