Hardness
Very Hard
376.5 PPM · 22 GPG
Local water dashboard
Official source aggregationWater quality in Addison, MI 49220
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Lenawee County.
1 reported benchmark flag
- Primary matched system
- Addison
- Source water
- Groundwater
- County
- Lenawee 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
0.0024 mg/L
16% of action level
Utility match
1 system
Serves 605 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
376.5 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
376.5
mg/L as CaCO₃ equivalent
Grains per gallon
22
1 GPG ≈ 17.1 PPM
What this means at home
At 376.5 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
92
Nearest site
8.8 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: Grand River Fen piezometer 3a-Jackson County, MI (Well).USGS source documentation ↗
Regional context
Is 49220 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Addison median
377 PPM
About the same1 indexed ZIP readings · Range 376.5–376.5 PPM
Michigan median
283 PPM
94 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 pass1 fail
Lead (PB90)
0.0024 mg/L
Reported Dec 31, 2023
Copper (CU90)
Not available
No numerical 90th-percentile result
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.0024
EPA limit 0.015
Arsenic
Measured in MG/L
Local 0.016
EPA limit 0.01
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 12
- Health-based
- 4
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| LEAD AND COPPER RULE REVISIONS | MI0000030 | Resolved | Jul 2, 2025through Jul 2, 2025 |
| Consumer Confidence Rule | MI0000030 | Resolved | Jul 1, 2025through Sep 15, 2025 |
| Consumer Confidence Rule | MI0000030 | Resolved | Jul 1, 2025through Jan 7, 2026 |
| ArsenicHealth-basedReported 0.016 MG/L · MCL 0.01 | MI0000030 | Resolved | Apr 1, 2025through Jun 30, 2025 |
| ArsenicHealth-basedReported 0.016 MG/L · MCL 0.01 | MI0000030 | Resolved | Jan 1, 2025through Mar 31, 2025 |
| ArsenicHealth-basedReported 0.018 MG/L · MCL 0.01 | MI0000030 | Resolved | Oct 1, 2024through Dec 31, 2024 |
| ArsenicHealth-basedReported 0.013 MG/L · MCL 0.01 | MI0000030 | Resolved | Jul 1, 2024through Sep 30, 2024 |
| Consumer Confidence Rule | MI0000030 | Unaddressed | Jul 1, 2024 |
| Arsenic | MI0000030 | Resolved | Nov 1, 2023through Nov 30, 2023 |
| E. COLI | MI0000030 | Resolved | Jun 8, 2023through Jul 5, 2023 |
| Arsenic | MI0000030 | Resolved | May 1, 2022through May 31, 2022 |
| Lead and Copper Rule | MI0000030 | Resolved | Oct 11, 2021through Dec 3, 2021 |
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 Addison ZIP 49220 using 376.5 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
376.5 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 systemsDrinking water protection
Under-Sink Reverse Osmosis System
Arsenic has a measured benchmark flag or active health-based SDWIS record in this profile.
A certified multi-stage RO system targets a broader range of dissolved contaminants at the kitchen tap.
Explore under-sink filtrationAffiliate 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 Addison
Is tap water safe in Addison?+
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 376.5 PPM, or 22 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 376.5 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.