Hardness
Very Hard
373.5 PPM · 21.8 GPG
Local water dashboard
Official source aggregationWater quality in Whitmore Lake, MI 48189
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Washtenaw County.
No active health-based violation reported
- Primary matched system
- Westbrook Apartments
- Source water
- Groundwater
- County
- Washtenaw County
- Profile updated
At a glance
What the current records say
EPA quarter 2026Q2
Compliance screen
No active flag
0 active health-based records
Lead 90th percentile
0.002 mg/L
13% of action level
Utility match
3 systems
Serves 330 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
373.5 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
373.5
mg/L as CaCO₃ equivalent
Grains per gallon
21.8
1 GPG ≈ 17.1 PPM
What this means at home
At 373.5 PPM, mineral scale can build up on fixtures and heating elements, reduce soap lather, and leave visible spotting. Hardness is primarily an aesthetic and appliance concern—not itself a tap-water safety rating.
USGS sites used
102
Nearest site
4.6 mi
Observation range
Jun 20, 2016–Oct 11, 2023
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: DWS093-10 (Well).USGS source documentation ↗
Regional context
Is 48189 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Whitmore Lake median
374 PPM
About the same1 indexed ZIP readings · Range 373.5–373.5 PPM
Michigan median
283 PPM
91 PPM higher504 indexed ZIP readings · Range 41.3–459.5 PPM
EPA benchmark screen
Contaminant snapshot
Available numerical results from associated SDWIS community water systems, compared with the applicable action level or federal MCL. Federal measured-value coverage is incomplete.
1 pass
Lead (PB90)
0.002 mg/L
Reported Dec 31, 2024
Copper (CU90)
Not available
No numerical 90th-percentile result
Numerical coverage
1 comparable result
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.002
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 11
- Health-based
- 2
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Consumer Confidence Rule | MI0007035 | Resolved | Jul 1, 2025through Aug 29, 2025 |
| Public Notice | MI0007099 | Resolved | Jan 19, 2025through Feb 5, 2025 |
| Public Notice | MI0007035 | Unaddressed | Jan 9, 2025 |
| Nitrate | MI0007035 | Resolved | Jan 1, 2025through Oct 29, 2025 |
| Nitrate | MI0007099 | Resolved | Jan 1, 2025through Oct 29, 2025 |
| LEAD AND COPPER RULE REVISIONSHealth-based | MI0007035 | Resolved | Oct 17, 2024through Jan 1, 2025 |
| LEAD AND COPPER RULE REVISIONS | MI0007035 | Resolved | Oct 17, 2024through Jan 1, 2025 |
| LEAD AND COPPER RULE REVISIONSHealth-based | MI0007099 | Resolved | Oct 17, 2024through Jan 1, 2025 |
| LEAD AND COPPER RULE REVISIONS | MI0007099 | Resolved | Oct 17, 2024through Jan 1, 2025 |
| Public Notice | MI0007099 | Resolved | Oct 28, 2023through Feb 14, 2024 |
| Lead and Copper Rule | MI0007099 | Resolved | Oct 11, 2022through Oct 26, 2022 |
No reported violation does not prove that every contaminant was tested or absent; SDWIS measured values are incomplete and lag state records.
Solutions matcher
Your personalized water action plan
Matched to Whitmore Lake ZIP 48189 using 373.5 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
373.5 PPM is 3× the high-hardness trigger used by this matcher.
Designed to reduce scale on fixtures, water heaters, glassware, and plumbing throughout the home.
Compare whole-house systemsAffiliate disclosure: we may earn a commission from qualifying purchases, at no added cost to you. Product matching is educational and does not replace certified water testing.
Frequently asked
Water questions for Whitmore Lake
Is tap water safe in Whitmore Lake?+
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?+
Nearby USGS observations produce an estimate of 373.5 PPM, or 21.8 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 373.5 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.