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Water Hardness in Research Triangl, NC

North Carolina · 1 zip codes · 3 matched water systems

35 PPM
2 GPG
Soft
0Soft60120180300+
Verified — Annual Water Quality Report

City avg (weighted): 35 PPM

Dataset updated March 9, 20263 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology

System used for this reading
Durham, City Of
NC0332010
Water source: surface water
Serves: 322,083
USGS environmental estimate: 39 PPM
Source context

How this city reading is built

This city reading is a weighted rollup across 3 matched water systems and 1 ZIP code. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.

Source basis
1 verified treated-water source
3 matched systems total for this city; 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 in Research Triangl

These systems are matched to Research Triangl, NC. Citywide readings are useful for comparison, but the system serving a specific address may differ from the city average.

3 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.
Durham, City Of
NC0332010
Soft
35 PPMsurface water322,083 servedVerified — Annual Water Quality Report
Source water: 39 PPM
Southern Trace S/D
NC4392141
Soft
39 PPMgroundwater485 servedHigh Confidence — USGS Monitoring
Durham County Rougemont Water System
NC4032018
Soft
39 PPMgroundwater84 servedHigh Confidence — USGS Monitoring

Zip Codes in Research Triangl, NC

2771335

What This Means For You

Recommendations are based on the displayed hardness reading. Confirm your tap reading before sizing or buying treatment equipment.

Your Water Is Soft

Your water hardness is in the soft range. You likely don't need a water softener. Enjoy your naturally soft 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 Research Triangl, NC.

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Frequently Asked Questions

How hard is the water in Research Triangl, NC?

The citywide weighted average water hardness in Research Triangl, NC is 35 PPM (2 GPG), classified as soft. This is based on 3 matched water systems.

Do I need a water softener in Research Triangl, NC?

At 35 PPM, the citywide average is relatively soft. A water softener is generally not necessary.

Is hard water in Research Triangl, NC 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 Research Triangl, NC?

Research Triangl, North Carolina is served by 3 matched water systems across 1 zip code.

Learn More About Your Water

Water Hardness Scale: PPM and GPG Chart

Use the USGS water hardness scale to compare PPM, GPG, and mg/L levels from soft to very hard water.

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How to Test Water Hardness at Home

Compare free lookups, soap tests, test strips, liquid drop kits, and lab tests for measuring water hardness.

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