Water Hardness in 10509
Brewster, New York · Putnam County
Dataset updated March 9, 2026Matched to 18 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 18 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.
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 10509
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.
| Water System | Source | Hardness | Pop. Served |
|---|---|---|---|
Buchanan Village NY5903422 | surface water | 69 PPM Slightly Hard | |
Brewster Village NY3903639 | groundwater | 294 PPM Very Hard | |
Brewster Heights NY3905680 | surface water | 69 PPM Slightly Hard | |
Dover Plains Water Co NY1302761 | groundwater | 294 PPM Very Hard | |
Green Chimneys: Main Well NY3921720 | groundwater | 294 PPM Very Hard |
Nearby Zip Codes
What This Means For You
Recommendations are based on the displayed ZIP hardness reading. Confirm your tap reading before sizing or buying treatment equipment.
Hard Water - Treatment Recommended
Your water is hard. Scale buildup is likely affecting your plumbing and appliances, reducing their lifespan and efficiency. A water softener is recommended to protect your home.
Recommended Products
Learn more: Do I Need a Water Softener? | Salt-Based vs Salt-Free | Size Calculator | 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 Brewster, NY (10509).
Frequently Asked Questions
Is the water hard in Brewster, NY (10509)?
The average water hardness in 10509 is 213 PPM (12.5 GPG), which is classified as hard.
Do I need a water softener in 10509?
With hardness of 213 PPM, a water softener is recommended for homes in 10509.
Is hard water in 10509 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 10509?
Zip code 10509 in Brewster, New York is served by 18 water systems.
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