Utility-reported hardness
Unavailable
Ask your provider or test your tap
Local water dashboard
Official source aggregationWater quality in Green Bay, WI 54302
Regional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for Brown County.
Historical measurement record needs context
- Largest possible serving system
- Green Bay Waterworks
- Source water
- Surface water
- County
- Brown 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
5 systems
Serves 107,369 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.
Green Bay Waterworks
WI4050356 · Surface water · 107,369 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
- 0.0025 mg/L
- Action level
- 0.015 mg/L
17% of the listed benchmark
Monitoring period: Jun 1, 2023 to Sep 30, 2023
Violation history (0)
No record returned in this imported window. This is not a guarantee of tap-water safety.
Howard Waterworks
WI4050468 · Surface water · 21,133 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 (2)
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
- 0.0012 mg/L
- Action level
- 0.015 mg/L
8% of the listed benchmark
Monitoring period: Jun 1, 2023 to Sep 30, 2023
Copper (90th percentile)
EPA SDWIS Lead and Copper Rule samples
- Reported level
- 1.4 mg/L
- Action level
- 1.3 mg/L
108% of the listed benchmark
Monitoring period: Jul 1, 1992 to Dec 31, 1992
Violation history (3)
| Rule | Status | Period |
|---|---|---|
| LEAD AND COPPER RULE REVISIONSHealth-based | Resolved | Oct 17, 2024 to May 27, 2025 |
| Public Notice | Resolved | Oct 17, 2024 to Jun 27, 2025 |
| Groundwater RuleHealth-based | Resolved | Dec 16, 2023 to Dec 19, 2023 |
Ashwaubenon Waterworks
WI4050456 · Surface water · 17,730 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
- 0.0034 mg/L
- Action level
- 0.015 mg/L
23% of the listed benchmark
Monitoring period: Jun 1, 2023 to Sep 30, 2023
Violation history (1)
| Rule | Status | Period |
|---|---|---|
| Revised Total Coliform Rule | Resolved | Sep 1, 2025 to Sep 30, 2025 |
Bellevue Waterworks
WI4050459 · Surface water · 16,715 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
- 0.0027 mg/L
- Action level
- 0.015 mg/L
18% of the listed benchmark
Monitoring period: Jun 1, 2023 to Sep 30, 2023
Violation history (3)
| Rule | Status | Period |
|---|---|---|
| Revised Total Coliform Rule | Resolved | Nov 1, 2021 to Nov 30, 2021 |
| Total Haloacetic Acids (HAA5) | Resolved | Oct 1, 2021 to Dec 31, 2021 |
| TTHM | Resolved | Oct 1, 2021 to Dec 31, 2021 |
Allouez Waterworks
WI4050455 · Surface water · 13,923 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
- 0.0059 mg/L
- Action level
- 0.015 mg/L
39% of the listed benchmark
Monitoring period: Jun 1, 2023 to Sep 30, 2023
Violation history (2)
| Rule | Status | Period |
|---|---|---|
| Public Notice | Resolved | Oct 17, 2024 to Jun 30, 2025 |
| LEAD AND COPPER RULE REVISIONSHealth-based | Resolved | Oct 17, 2024 to Dec 13, 2024 |
Hardness meter
What does nearby environmental evidence show?
254
PPM as CaCO₃
Very Hard
PPM
254
GPG
14.9
Regional environmental evidence
USGS hardness classification scale
254 PPM
Soft
0–60Moderate
61–120Hard
121–180Very hard
181+
0–60Moderate
61–120Hard
121–180Very hard
181+
Parts per million
254
mg/L as CaCO₃ equivalent
Grains per gallon
14.9
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
2
Nearest site
2.2 mi
Observation range
Aug 9, 2016–Feb 4, 2020
Regional evidence confidence
Low
Median of the latest source-type-aligned hardness observation at each monitoring site within 25 miles. Nearest monitoring location: FOX RIVER AT OIL TANK DEPOT AT GREEN BAY, WI (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 54302 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Green Bay median
254 PPM
About the same4 indexed ZIP readings · Range 254–254 PPM
Wisconsin median
278 PPM
24 PPM lower318 indexed ZIP readings · Range 69–824 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
A reported action-level record needs context. Check its monitoring period and the utility's current report.
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 Green Bay
Estimates can differ across a city because monitoring locations and associated systems differ.
Frequently asked
Water questions for Green Bay
Is tap water safe in Green Bay?+
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.