Where does the water in 43140 come from?

Water for zip code 43140 in London, Ohio is provided by 3 water systems. Contact your local utility for specific source information, or check our detailed page for your area.

Water Hardness in 43140

London, Ohio · Madison County

182 PPM

10.6 GPG

Hard

0Soft60120180300+

Verified — Annual Water Quality Report

Dataset updated March 9, 2026Matched to 3 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 3 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

1 verified treated-water source

3 matched systems total for this ZIP; treated-water reports are prioritized when available.

Water source profile

Primarily groundwater

Groundwater commonly picks up calcium and magnesium after contact with rock and soil. 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 43140

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.

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.

Water System	Source	Hardness	Pop. Served	Data Source
London City Pws OH4900712	groundwater	120 PPM Moderately Hard USGS estimate: 236 PPM	10,256	Verified — Annual Water Quality Report
Choctaw Utilities, Inc. OH4900212	groundwater	400 PPM Very Hard	2,200	Estimated — Nearby Data
Green Meadows Mobile Home Park OH4901812	groundwater	400 PPM Very Hard	730	Estimated — Nearby Data

London City Pws

OH4900712

Moderately Hard

120 PPMgroundwater10,256 servedVerified — Annual Water Quality Report

Source water: 236 PPM

Choctaw Utilities, Inc.

OH4900212

Very Hard

400 PPMgroundwater2,200 servedEstimated — Nearby Data

Green Meadows Mobile Home Park

OH4901812

Very Hard

400 PPMgroundwater730 servedEstimated — Nearby Data

Nearby Zip Codes

43162208 45369156 43151120 43153133 45368157 43119128 43010155 43044399 43143165 43126128 43029125 43106268

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

Salt-Based Water Softener

Our PickAFWFilters Fleck 5600SXT 48K Also GreatWhirlpool WHES40E 40K Also GreatAFWFilters 64K Grain Also GreatAFWFilters Iron Pro 2 64K Also GreatSpringWell Filter + Softener Combo

Salt-Free Water Conditioner

Our PickSpringWell Salt-Free Cartridge

Water Hardness Test Kit

Our PickVarify (150 Strips)Also GreatJNW Direct (150 Strips)

Shower Head Filter

Our PickWeddell Duo Also GreatAquaBliss SF100 Also GreatSprite Pure 7-Setting Also GreatAqua Earth 20-Stage

Water Softener Salt

Our PickMorton Clean & Protect Also GreatDiamond Crystal Bright & Soft

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 London, OH (43140).

Submit Your Data

Frequently Asked Questions

Is the water hard in London, OH (43140)?

The average water hardness in 43140 is 182 PPM (10.6 GPG), which is classified as hard.

Do I need a water softener in 43140?

With hardness of 182 PPM, a water softener is recommended for homes in 43140.

Is hard water in 43140 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 43140?

Zip code 43140 in London, Ohio is served by 3 water systems.