Water Hardness in 04730
Houlton, Maine · Aroostook County
Dataset updated March 9, 2026Matched to 6 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 6 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 04730
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 |
|---|---|---|---|
Houlton Water Company ME0090700 | groundwater | 94 PPM Slightly Hard | |
Riverside Court ME0002429 | groundwater | 94 PPM Slightly Hard | |
Caribou Stream Mobile Home Pk ME0002439 | groundwater | 94 PPM Slightly Hard | |
Loring Woods Park ME0007968 | groundwater | 94 PPM Slightly Hard | |
Crest View Manor ME0095020 | groundwater | 94 PPM Slightly 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.
Slightly Hard Water
Your water is slightly hard. You may notice minor spotting on dishes or a slight film on faucets. A water softener is optional but can improve water quality.
Recommended Products
Learn more: Do I Need a Water Softener? | Salt-Based vs Salt-Free | 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 Houlton, ME (04730).
Frequently Asked Questions
Is the water hard in Houlton, ME (04730)?
The average water hardness in 04730 is 94 PPM (5.5 GPG), which is classified as slightly hard.
Do I need a water softener in 04730?
At 94 PPM, your water is relatively soft. A water softener is generally not necessary.
Is hard water in 04730 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 04730?
Zip code 04730 in Houlton, Maine is served by 6 water systems.
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