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Does my city have hard water?

Almost always the honest answer is: your water system has published a hardness figure, your city has not, and the two are not the same thing. This page shows you how to find which public water system serves your address, and then how to find the report where that system published its own hardness number. Both steps use free federal lookups. Neither of them needs this site.

Why there is no figure for a ZIP code here, or anywhere

A ZIP code is a mail-delivery boundary drawn by the Postal Service. A water system's service area is a pipe network drawn by whoever built it. They do not line up, and nothing forces them to: one ZIP code can be served by three systems, and one system can cover forty ZIP codes. A site that hands you a single hardness number for a ZIP code has either picked one system and hidden that choice, or averaged several systems into a figure no utility ever published.

This site does neither, which is why it has no ZIP lookup and will not get one. Every figure here is the number a named utility printed in its own report, with the report year and the document it came from. That is a narrower promise and a keepable one. The cost is coverage: there are 10 systems on this site and tens of thousands in the United States, so the odds are that yours is not one of them yet. The two steps below are how you get your own figure anyway.

Step 1 — find the system that serves you

The EPA runs a public search over the Safe Drinking Water Information System. Its SDWIS Federal Reporting Services page carries a Water System Search that you can run by clicking your state on a map, or by filling any of these fields, labelled on the page as:

Searching your city name usually returns more than one system, and that is the point of doing this rather than guessing. What you are looking for is the one whose name matches the utility on your water bill. If you are on a private well, no system here covers you at all and no utility report describes your water — that case is different in kind.

Write down the system's name and, if the search gives it, its PWS ID. An ID is worth keeping because a utility name can be ambiguous and an ID is not: the pages on this site that have one print it for the same reason.

The SDWIS search was read on 2026-10-17. It does not report hardness, and you should not expect it to. Hardness sits under a secondary standard, which is a non-enforceable guideline about taste, odour and appearance rather than health — what the column headings in a report mean covers that distinction. The figure lives in the utility's own report, which is step 2.

Step 2 — find that system's report, and its hardness line

Every community water system in the United States has to give its customers an annual water quality report, also called a Consumer Confidence Report. The EPA's Consumer Confidence Reports page points consumers at a lookup under the wording "Find your local CCR", and also links a finder at sdwis.epa.gov/fylccr. Most utilities also publish the report on their own site, usually under "water quality".

Then you have to find the hardness line inside it, which is its own small skill, because reports bury hardness in different places under different labels and different units. How to read a water quality report walks through it with the real reports behind this site as the worked examples — including the ones where there is no hardness line at all.

The EPA CCR page was read on 2026-10-17.

What to expect to find — and not find

Three things go wrong often enough to be worth warning about, and all three are visible in the 10 systems on this site.

The report may not publish hardness at all. It is not a required line. Manchester Water Works is the clean example: its reporting-year 2022 report carries a Total Hardness line and its 2023, 2024 and 2025 reports do not. That is why the figure on this site for Manchester is a 2022 figure and why the page says so on its face.

The unit may not be the one you expect. Denver Water publishes hardness in parts per billion. San Antonio Water System publishes it only in grains per gallon. Read the unit column before the value column, then convert it.

The figure may be a range, not a number. Citizens Energy Group in Indianapolis publishes a system-wide range of 148 to 460 mg/L. Both ends are real measurements from the same system. If you are sizing equipment, size it against both ends and look at the gap before you pick one.

The systems already transcribed here

If your system is one of these, the work is done: the published figure, the verbatim wording of the hardness line, the report year and the source document are all on its page.

Systems looked for and deliberately left out

Two large systems were searched for and got no page, because no hardness figure could be read on an official document. They are listed here rather than filled with an estimate.

Seattle Public Utilities
No hardness line in the 2025 Drinking Water Quality Report, and the Water Quality Analyses index page did not render its quarterly-analysis links to us. SPU's quarterly surface water analyses are the likely home of the figure; this is a page to add once one of those documents can be read directly. Checked 2026-10-16.
City of Chicago Department of Water Management
The 2021 Water Quality Report carries no hardness line. The Comprehensive Chemical Analysis index and the CHI311 hardness article are rendered by scripts and returned no values or document links to us. Chicago's figure is most likely in a Comprehensive Chemical Analysis PDF; no page here until one is read. Checked 2026-10-16.

If you are in one of those two cities, step 1 and step 2 above are still the route to a real number, and they may well succeed where this site did not: a document that a fetching tool cannot render is often perfectly readable in a browser.

What a verified figure still does not tell you

A system figure is a reported value across a whole distribution system, over a set of sampling points and sampling dates. It is not a reading at your tap. Water sits in different pipes on its way to different houses, some systems blend sources seasonally, and a system that changes a source changes its chemistry — Manchester brought a river source online in August 2023, after the last report that published a hardness line.

So: use the published figure to know roughly where you stand, and test your own tap before you spend money on equipment sized to a number that describes a network. The methodology page lists every source, every retrieval date and every assumption behind this site, including the ones that are ours rather than a utility's.