Hardness
Soft
30.3 PPM · 1.8 GPG
Local water dashboard
Official source aggregationWater quality in Chatham, MA 02633
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Barnstable County.
No active health-based violation reported
- Primary matched system
- Chatham Water Department
- Source water
- Groundwater
- County
- Barnstable 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
0.0011 mg/L
7% of action level
Utility match
1 system
Serves 30,000 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
30.3 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
30.3
mg/L as CaCO₃ equivalent
Grains per gallon
1.8
1 GPG ≈ 17.1 PPM
What this means at home
At 30.3 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
57
Nearest site
27 mi
Observation range
May 16, 2016–Aug 24, 2023
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: MA-MIW 29 MASHPEE, MA (Well).USGS source documentation ↗
Regional context
Is 02633 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Chatham median
30 PPM
About the same1 indexed ZIP readings · Range 30.3–30.3 PPM
Massachusetts median
49 PPM
19 PPM lower328 indexed ZIP readings · Range 24.3–128 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)
0.0011 mg/L
Reported Jun 30, 2025
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 0.0011
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 0
- Health-based
- 0
- Active health-based
- 0
No violation record was returned for the associated systems in the imported lookback window beginning Jan 1, 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 Chatham ZIP 02633 using 30.3 PPM nearby hardness and 1 reported measurement benchmarks.
No urgent match
Start with an independent water test
This profile does not trigger a treatment recommendation. Test at the tap before investing in equipment.
Affiliate 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 Chatham
Is tap water safe in Chatham?+
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 30.3 PPM, or 1.8 grains per gallon, classified as soft. This is not a household tap measurement.
Do I need a water softener?+
There is no high-hardness trigger in this profile. Confirm with a tap test before buying equipment.