Hardness
Very Hard
311.5 PPM · 18.2 GPG
Local water dashboard
Official source aggregationWater quality in Zionsville, IN 46077
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Boone County.
1 reported benchmark flag
- Primary matched system
- Citizens Water - Whitestown
- Source water
- Surface water + Groundwater
- County
- Boone 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
3.3e-4 mg/L
2% of action level
Utility match
3 systems
Serves 5,880 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
311.5 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
311.5
mg/L as CaCO₃ equivalent
Grains per gallon
18.2
1 GPG ≈ 17.1 PPM
What this means at home
At 311.5 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
8
Nearest site
7.8 mi
Observation range
Jan 5, 2016–May 28, 2026
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: SCHOOL BRANCH AT MALONEY ROAD NEAR BROWNSBURG, IN (Stream).USGS source documentation ↗
Regional context
Is 46077 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Zionsville median
312 PPM
About the same2 indexed ZIP readings · Range 311.5–311.5 PPM
Indiana median
313 PPM
About the same472 indexed ZIP readings · Range 132–371 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)
3.3e-4 mg/L
Reported Dec 31, 2025
Copper (CU90)
1.482 mg/L
Reported Dec 31, 2011
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 3.3e-4
EPA limit 0.015
Copper (90th percentile)
Measured in mg/L
Local 1.482
EPA limit 1.3
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 180
- Health-based
- 4
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Lead and Copper Rule | IN5206002 | Resolved | Jan 1, 2026through Mar 26, 2026 |
| Radium-226 | IN5206002 | Archived | Jan 1, 2026through Mar 31, 2026 |
| Radium-228 | IN5206002 | Archived | Jan 1, 2026through Mar 31, 2026 |
| Gross Alpha, Excl. Radon and U | IN5206002 | Archived | Jan 1, 2026through Mar 31, 2026 |
| Consumer Confidence Rule | IN5206002 | Resolved | Oct 1, 2025through Mar 30, 2026 |
| Consumer Confidence Rule | IN5206014 | Resolved | Jul 1, 2025through Nov 10, 2025 |
| Revised Total Coliform Rule | IN5206002 | Resolved | Jul 1, 2025through Jul 31, 2025 |
| Consumer Confidence Rule | IN5206002 | Resolved | Jul 1, 2025through Mar 30, 2026 |
| Revised Total Coliform Rule | IN5206002 | Resolved | Jun 1, 2025through Jun 30, 2025 |
| Revised Total Coliform Rule | IN5206002 | Resolved | May 1, 2025through May 31, 2025 |
| Revised Total Coliform Rule | IN5206002 | Resolved | Apr 1, 2025through Apr 30, 2025 |
| Revised Total Coliform Rule | IN5206002 | Resolved | Mar 1, 2025through Mar 31, 2025 |
| Revised Total Coliform Rule | IN5206002 | Resolved | Feb 1, 2025through Feb 28, 2025 |
| Endrin | IN5206002 | Archived | Jan 1, 2025through Dec 31, 2025 |
| Methoxychlor | IN5206002 | Archived | Jan 1, 2025through Dec 31, 2025 |
| Toxaphene | IN5206002 | Archived | Jan 1, 2025through Dec 31, 2025 |
| Glyphosate | IN5206002 | Archived | Jan 1, 2025through Dec 31, 2025 |
| OXAMYL | IN5206002 | Archived | Jan 1, 2025through Dec 31, 2025 |
| Di(2-ethylhexyl) phthalate | IN5206002 | Archived | Jan 1, 2025through Dec 31, 2025 |
| Dinoseb | IN5206002 | Archived | Jan 1, 2025through Dec 31, 2025 |
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 Zionsville ZIP 46077 using 311.5 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
311.5 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
Copper (90th percentile) 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.
Nearby indexed reports
Compare ZIPs in Zionsville
Estimates can differ across a city because monitoring locations and associated systems differ.
Frequently asked
Water questions for Zionsville
Is tap water safe in Zionsville?+
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 311.5 PPM, or 18.2 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 311.5 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.