Where does the water in 12775 come from?

Water for zip code 12775 in Rock Hill, New York is provided by 2 water systems. Contact your local utility for specific source information, or check our detailed page for your area.

Water Hardness in 12775

Rock Hill, New York · Sullivan County

110 PPM

6.4 GPG

Slightly Hard

0Soft60120180300+

High Confidence - USGS Monitoring

Dataset updated March 9, 2026Matched to 2 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology

Source context

How this ZIP reading is built

This ZIP reading is built from 2 matched water systems. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.

Source basis

2 USGS-backed sources

2 matched systems total for this ZIP; USGS monitoring is used where treated-water reports are unavailable.

Water source profile

Primarily surface water

Surface-water hardness can shift with reservoirs, runoff, season, and treatment. This profile is weighted by known population served across matched systems.

Data recency

March 9, 2026

Dataset rebuilt March 9, 2026; individual utility reporting years can vary.

Hardness is a mineral-content reading, not a drinking-water safety rating. Use it for scale, appliance, and softener decisions; check your utility report or test your tap before sizing treatment equipment. See how we calculate local readings.

Water Systems Serving 12775

These are the systems matched to this ZIP code. The displayed ZIP value is weighted toward larger known service populations when population data is available.

2 water systems

PWSID is the public water system identifier. Data Source shows whether the hardness value comes from a treated-water report, USGS monitoring, or a local estimate; source year is shown when available.

Water System	Source	Hardness	Pop. Served	Data Source
Emerald Green Lake Louise Marie Wc NY5203346	surface water	134 PPM Moderately Hard	2,400	High Confidence - USGS Monitoring
Callicoon Wd NY5203321	groundwater	41 PPM Soft	850	High Confidence - USGS Monitoring

Emerald Green Lake Louise Marie Wc

NY5203346

Moderately Hard

134 PPMsurface water2,400 servedHigh Confidence - USGS Monitoring

Callicoon Wd

NY5203321

Soft

41 PPMgroundwater850 servedHigh Confidence - USGS Monitoring

Nearby Zip Codes

1273841 1278441 12790106 1278541 1277941 1276341 1275148 1270121 1278934 1277741 12435202 1273341

What This Means For You

Use this ZIP reading as a local planning estimate, not a final treatment specification. Hardness can vary by utility zone, seasonal blend, private well, and building plumbing. Confirm your tap reading with a utility report or home hardness test before sizing equipment.

Methodology Data sources How to test your water

Know your water hardness?

If you've tested your water or have your utility's CCR report, share your reading to help us improve accuracy for Rock Hill, NY (12775).

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Frequently Asked Questions

Is the water hard in Rock Hill, NY (12775)?

The average water hardness in 12775 is 110 PPM (6.4 GPG), which is classified as slightly hard.

Do I need a water softener in 12775?

At 110 PPM, your water is relatively soft. A water softener is generally not necessary.

Is hard water in 12775 safe to drink?

Water hardness itself is a mineral-content reading, not a drinking-water safety rating. Calcium and magnesium are naturally occurring minerals, but you should check your utility's Consumer Confidence Report for contaminant and compliance information.

How many water systems serve 12775?

Zip code 12775 in Rock Hill, New York is served by 2 water systems.