Utility-reported hardness
Unavailable
Ask your provider or test your tap
Local water dashboard
Official source aggregationWater quality in Thornton, CO 80233
Regional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for Adams County.
No active health-based violation reported
- Largest possible serving system
- Thornton City Of
- Source water
- Surface water
- County
- Adams County
- Profile updated
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 →At a glance
What the current records say
EPA quarter 2026Q2
All possible systems
No active flag
0 active health-based records
Measurements by utility
Each result belongs to a specific system.
Utility match
7 systems
Serves 226,465 people system-wide
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
- 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)
| 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
- 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)
| 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
- 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
- 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)
| 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
- 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)
| 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
- 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)
| 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
- 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)
| Rule | Status | Period |
|---|---|---|
| Lead and Copper Rule | Resolved | Jan 1, 2026 to Apr 16, 2026 |
Hardness meter
What does nearby environmental evidence show?
349
PPM as CaCO₃
Very Hard
PPM
349
GPG
20.4
Regional environmental evidence
USGS hardness classification scale
349 PPM
Soft
0–60Moderate
61–120Hard
121–180Very hard
181+
0–60Moderate
61–120Hard
121–180Very hard
181+
Parts per million
349
mg/L as CaCO₃ equivalent
Grains per gallon
20.4
1 GPG ≈ 17.1 PPM
How to use regional evidence
These samples describe nearby environmental water. They cannot establish whether your tap water is soft or hard. Use a utility result or a tap test for appliance settings and treatment sizing.
USGS sites used
1
Nearest site
11.1 mi
Observation range
May 8, 2026–May 8, 2026
Regional evidence confidence
Low
Median of the latest source-type-aligned hardness observation at each monitoring site within 25 miles. Nearest monitoring location: CHERRY CREEK AT DENVER, CO. (Stream).USGS source documentation ↗Evidence tier: Regional environmental evidence. This value is not used as proof of the serving utility's treated-water hardness.
Regional context
Is 80233 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Thornton median
349 PPM
About the same5 indexed ZIP readings · Range 349–349 PPM
Colorado median
349 PPM
About the same153 indexed ZIP readings · Range 7.2–2135 PPM
Evidence-first next steps
Confirm the problem before choosing treatment
This profile can help you ask the right question. It cannot select equipment for a property without a current result from the serving utility or the tap.
Confirm the serving system
ZIP boundaries and utility service areas do not perfectly match. Verify the system on a water bill before relying on system-wide records.
Read the current utility report
Use the current Consumer Confidence Report for treated-water results and official notices.
Find an official utility report →Test for the decision you face
Use a tap hardness test before sizing a softener. For health concerns, use a certified laboratory and the correct sampling protocol.
Convert your hardness test result →Nearby indexed reports
More local profiles in Thornton
Estimates can differ across a city because monitoring locations and associated systems differ.
Frequently asked
Water questions for Thornton
Is tap water safe in Thornton?+
EPA ECHO shows no active health-based violation for the associated systems in this reporting snapshot. This does not prove every contaminant is absent; federal records can lag and household plumbing can change tap conditions.
How hard is the water?+
Utility-reported hardness is unavailable in this index. Regional samples do not establish tap-water hardness. Ask your provider or test your tap.
Do I need a water softener?+
Confirm hardness at your tap and consider actual scale or spotting before choosing treatment. Regional environmental values cannot determine whether you need a softener. A softener addresses hardness, not every contaminant.