Las Vegas water hardness by ZIP code, utility by utility

Find your ZIP code

Start typing your ZIP and the list shrinks to match. For each ZIP you get every water system that supplies part of it, how much of the ZIP’s area each one covers, the hardness that system publishes and the softener setting that goes with it.

A blank hardness cell means one of two things: the system doesn’t publish a hardness figure, or it isn’t in our data yet. Either way, a test kit settles it. Our Las Vegas water softener settings page explains how to turn a test result into a dial number.

Which water system serves my Las Vegas ZIP?

Most of the valley, including Las Vegas itself, Summerlin and the unincorporated county, gets water from the Las Vegas Valley Water District. The other large suppliers are cities with their own utilities: Henderson, North Las Vegas and Boulder City. Farther out, Laughlin, Mesquite and Bunkerville, Mount Charleston, Blue Diamond, Jean and Searchlight each run on a separate small system, most of them on wells. Three of these towns have a page on their own safety results: is Boulder City tap water safe to drink, is Laughlin tap water safe to drink and is Mesquite, Nevada tap water safe to drink.

Water doesn’t respect ZIP lines. Along the Henderson and North Las Vegas borders, one ZIP can be split between two suppliers, which is why some rows list more than one.

Is Las Vegas water hard everywhere?

Yes, almost everywhere. The Las Vegas Valley Water District publishes 280 parts per million (16 grains per gallon) for its whole service area, and the City of Henderson 304 parts per million. Lake Mead supplies most of the valley, so the big systems sit close together. The well-fed outlying systems differ more: some are harder still, and Searchlight’s main wells are much softer. Our Las Vegas water hardness page compares every system side by side.

North Las Vegas is the gap. The city calls its water hard in its annual report but gives no number, so North Las Vegas rows show no figure. The North Las Vegas softener page explains what to do instead.

Las Vegas water hardness map: where the lookup comes from

We didn’t draw our own map. The lookup combines three public sources:

• Water system areas: the U.S. Environmental Protection Agency’s map data of community water system service areas, version 3, released in March 2026. For the large valley utilities the outlines come from the systems; for most small rural systems EPA estimated them.
• ZIP code areas: the U.S. Census Bureau’s ZIP Code Tabulation Areas from its 2025 TIGER/Line files.
• Hardness: each system’s own published figure, as listed on our water data sources page. Nothing is adjusted.

A system counts for a ZIP when it covers at least 2% of the ZIP’s area, or when most of a small system sits inside that ZIP. The second rule keeps places like Jean and Blue Diamond in the table, since each is a small dot inside a very large desert ZIP.

When the ZIP answer isn’t enough

• Census ZIP areas are close to, not the same as, postal ZIP codes, and brand-new ZIPs may be missing.
• EPA’s estimated outlines for small systems can be rough at the edges.
• Mesquite’s water district covers Bunkerville too, but EPA’s estimated outline doesn’t reach the Bunkerville ZIP, so that row shows no system. The Mesquite softener page has the district’s figure.
• On a private well there is no utility figure at all: test the water yourself.

Sources for this page

• U.S. Environmental Protection Agency · public map data of community water system service areas, version 3 · March 2026 · which system serves which area
• U.S. Census Bureau · TIGER/Line ZIP Code Tabulation Areas · 2025 · ZIP areas
• Las Vegas Valley Water District · water quality summary · 2026 · 280 parts per million, 16 grains per gallon
• City of Henderson Department of Utility Services · annual water quality report · 2026 · 304 parts per million
• U.S. Geological Survey · water hardness scale · hardness bands