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Water Hardness in 80501

Longmont, Colorado · Boulder County

90 PPM
5.3 GPG
Slightly Hard
0Soft60120180300+
Verified — Annual Water Quality Report

Dataset updated March 9, 2026Matched to 11 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 11 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
11 verified treated-water sources
11 matched systems total for this ZIP; treated-water reports are prioritized when available.
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 80501

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.

11 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.
Boulder City Of
CO0107152
Slightly Hard
90 PPMsurface water166,080 servedVerified — Annual Water Quality Report
Source water: 151 PPM
Longmont City Of
CO0107485
Slightly Hard
90 PPMsurface water102,866 servedVerified — Annual Water Quality Report
Source water: 165 PPM
Erie Town Of
CO0162255
Slightly Hard
90 PPMsurface water40,061 servedVerified — Annual Water Quality Report
Source water: 158 PPM
Lafayette City Of
CO0107473
Slightly Hard
90 PPMsurface water28,700 servedVerified — Annual Water Quality Report
Source water: 158 PPM
Louisville City Of
CO0107487
Slightly Hard
90 PPMsurface water20,975 servedVerified — Annual Water Quality Report
Source water: 151 PPM
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

805048080503908054280805169080513808052080803019080514828053080800269180304908030390

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

Water Hardness Test Kit
Our PickVarify (150 Strips)Also GreatJNW Direct (150 Strips)
Salt-Free Water Conditioner
Our PickSpringWell Salt-Free Cartridge

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 Longmont, CO (80501).

Submit Your Data

Frequently Asked Questions

Is the water hard in Longmont, CO (80501)?

The average water hardness in 80501 is 90 PPM (5.3 GPG), which is classified as slightly hard.

Do I need a water softener in 80501?

At 90 PPM, your water is relatively soft. A water softener is generally not necessary.

Is hard water in 80501 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 80501?

Zip code 80501 in Longmont, Colorado is served by 11 water systems.

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