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Water Hardness in 20111

Fairfax Station, Virginia · Prince William County

14 PPM
0.8 GPG
Soft
0Soft60120180300+
High Confidence — USGS Monitoring

Dataset updated March 9, 2026Matched to 9 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 9 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
5 USGS-backed sources
9 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 20111

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.

9 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.
Pwcsa - East
VA6153600
Soft
10 PPMsurface water168,747 servedEstimated — County Avg
Pwcsa - West
VA6153251
Soft
10 PPMsurface water136,409 servedEstimated — County Avg
Dale City
VA6153625
Soft
5 PPMsurface water72,062 servedHigh Confidence — USGS Monitoring
Quantico Marine Base-Mainside
VA6153675
Soft
10 PPMsurface water19,000 servedHigh Confidence — USGS Monitoring
Manassas Park, City Of
VA6687100
Moderately Hard
152 PPMsurface water14,051 servedHigh Confidence — USGS Monitoring
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

20124120201101522012112020112922039120201099201369221929220301202012012022015120221939

What This Means For You

Recommendations are based on the displayed ZIP 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 Fairfax Station, VA (20111).

Submit Your Data

Frequently Asked Questions

Is the water hard in Fairfax Station, VA (20111)?

The average water hardness in 20111 is 14 PPM (0.8 GPG), which is classified as soft.

Do I need a water softener in 20111?

At 14 PPM, your water is relatively soft. A water softener is generally not necessary.

Is hard water in 20111 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 20111?

Zip code 20111 in Fairfax Station, Virginia is served by 9 water systems.

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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