Utility-reported hardness
Unavailable
Ask your provider or test your tap
Local water dashboard
Official source aggregationWater quality in Elm Grove, WI 53122
Regional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for Waukesha County.
1 active health-based record(s) across possible systems
- Largest possible serving system
- Squires Grove
- Source water
- Groundwater
- County
- Waukesha 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
Review needed
1 active health-based record
Measurements by utility
Each result belongs to a specific system.
Utility match
7 systems
Serves 410 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.
Squires Grove
WI2680201 · Groundwater · 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
- 0.0013 mg/L
- Action level
- 0.015 mg/L
8% of the listed benchmark
Monitoring period: Jun 1, 2024 to Sep 30, 2024
Violation history (3)
| Rule | Status | Period |
|---|---|---|
| LEAD AND COPPER RULE REVISIONS | Resolved | Jul 2, 2025 to Nov 28, 2025 |
| Lead and Copper Rule | Resolved | Jan 1, 2025 to Jan 2, 2025 |
| LEAD AND COPPER RULE REVISIONS | Resolved | Oct 17, 2024 to Oct 18, 2024 |
Marian Heights Subdivision
WI2680203 · Groundwater · 400 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: 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.
Emerald Woods Condos
WI2685370 · Groundwater · 150 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: Jun 1, 2024 to Sep 30, 2024
Violation history (4)
| Rule | Status | Period |
|---|---|---|
| LEAD AND COPPER RULE REVISIONSHealth-based | Resolved | Oct 17, 2024 to Oct 17, 2024 |
| Public Notice | Unaddressed | Oct 17, 2024 |
| Public Notice | Unaddressed | Oct 17, 2024 |
| LEAD AND COPPER RULE REVISIONS | Resolved | Oct 17, 2024 to Oct 17, 2024 |
Elm Grove Terrace
WI2680279 · Groundwater · 75 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
- 3.9e-4 mg/L
- Action level
- 0.015 mg/L
3% of the listed benchmark
Monitoring period: Jun 1, 2024 to Sep 30, 2024
Copper (90th percentile)
EPA SDWIS Lead and Copper Rule samples
- Reported level
- 4.4 mg/L
- Action level
- 1.3 mg/L
338% of the listed benchmark
Monitoring period: Jun 1, 2015 to Sep 30, 2015
Violation history (0)
No record returned in this imported window. This is not a guarantee of tap-water safety.
Douglas Plaza South
WI2680862 · Groundwater · 62 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
- 0.0029 mg/L
- Action level
- 0.015 mg/L
19% of the listed benchmark
Monitoring period: Jun 1, 2024 to Sep 30, 2024
Violation history (4)
| Rule | Status | Period |
|---|---|---|
| LEAD AND COPPER RULE REVISIONS | Unaddressed | Jul 2, 2025 |
| Consumer Confidence Rule | Resolved | Jul 1, 2025 to Oct 2, 2025 |
| Consumer Confidence Rule | Resolved | Jul 1, 2025 to Oct 2, 2025 |
| Public Notice | Unaddressed | Jul 1, 2010 |
Carriage Hills Condominiums
WI2682406 · Groundwater · 50 people served system-wide
The system names this served city; Census place overlap links the city to this ZCTA.
1 reported active health-based record(s) for this system
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
- 0.0013 mg/L
- Action level
- 0.015 mg/L
8% of the listed benchmark
Monitoring period: Jun 1, 2024 to Sep 30, 2024
Violation history (9)
| Rule | Status | Period |
|---|---|---|
| Lead and Copper Rule | Resolved | Jan 1, 2025 to Dec 11, 2025 |
| LEAD AND COPPER RULE REVISIONS | Resolved | Oct 17, 2024 to Feb 27, 2025 |
| Public Notice | Unaddressed | Oct 17, 2024 |
| Public Notice | Unaddressed | Oct 17, 2024 |
| LEAD AND COPPER RULE REVISIONSHealth-based | Unaddressed | Oct 17, 2024 |
| Groundwater RuleHealth-based | Resolved | Jul 2, 2023 to Aug 15, 2024 |
| Public Notice | Resolved | Jul 2, 2023 to Sep 12, 2024 |
| Consumer Confidence Rule | Resolved | Jul 1, 2021 to Dec 9, 2021 |
| Consumer Confidence Rule | Resolved | Jul 1, 2021 to Dec 9, 2021 |
Douglas Plaza North
WI2680288 · Groundwater · 30 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
- 0.0045 mg/L
- Action level
- 0.015 mg/L
30% of the listed benchmark
Monitoring period: Jun 1, 2024 to Sep 30, 2024
Violation history (5)
| Rule | Status | Period |
|---|---|---|
| LEAD AND COPPER RULE REVISIONS | Unaddressed | Jul 2, 2025 |
| Consumer Confidence Rule | Resolved | Jul 1, 2025 to Oct 2, 2025 |
| Consumer Confidence Rule | Resolved | Jul 1, 2025 to Oct 2, 2025 |
| Lead and Copper Rule | Resolved | Jan 1, 2025 to Jan 2, 2025 |
| Public Notice | Unaddressed | Jul 1, 2010 |
Hardness meter
What does nearby environmental evidence show?
518
PPM as CaCO₃
Very Hard
PPM
518
GPG
30.3
Regional environmental evidence
USGS hardness classification scale
518 PPM
Soft
0–60Moderate
61–120Hard
121–180Very hard
181+
0–60Moderate
61–120Hard
121–180Very hard
181+
Parts per million
518
mg/L as CaCO₃ equivalent
Grains per gallon
30.3
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
9
Nearest site
4.2 mi
Observation range
May 17, 2021–Aug 5, 2024
Regional evidence confidence
High
Median of the latest source-type-aligned hardness observation at each monitoring site within 25 miles. Nearest monitoring location: 7N20E-18.1c (Well).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 53122 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Elm Grove median
518 PPM
About the same1 indexed ZIP readings · Range 518–518 PPM
Wisconsin median
278 PPM
240 PPM higher318 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
An active health-based record is present. Follow the utility's current notice and public-health instructions.
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 →Frequently asked
Water questions for Elm Grove
Is tap water safe in Elm Grove?+
EPA ECHO reports 1 active health-based violation among the associated community water systems. Review the affected utility's current notice and Consumer Confidence Report.
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.