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Is Sioux City, IA tap water safe?

2 utilities serve Sioux City, by EPA’s records. Here is what EPA’s and Iowa’s records show for each, against the legal limits and the stricter health goals.

Matched to your utility using EPA records.

The short answer

1 of the 2 utilities serving Sioux City has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Iowa’s records: Sioux City Water Supply.

Sioux City Water Supply, which serves the most people here, has 3 results above EPA’s new limit, which takes effect in 2029, 2 results above the health goal and 1 result above EPA’s health benchmark. The worst: PFHxS at 35 ppt, above EPA’s new limit, which takes effect in 2029.

The water from Sioux City Water Supply is very hard, 581 mg/L (34 grains per gallon). How Iowa’s water compares.

A town can be served by more than one utility, and some homes are on private wells. The name on your water bill tells you which is yours, and your ZIP code narrows it down. They are listed by how many people each serves in Sioux City’s ZIP codes, from EPA’s estimates.

What handles it

Each of these is certified, on a certifier’s listing, for a result above a line in Sioux City Water Supply’s water, which serves the most people here. Another utility’s report names what handles its own results.

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Every claim, and more filters, in the full report

Water testing near Sioux City

A utility tests the water it sends out. A test of your own tap shows what your pipes add, and on a private well it is the only test there is. It takes a lab Iowa certifies.

The 3 labs Iowa certifies closest to Sioux City, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Siouxland District Health Department

    Sioux City, IA · about 2 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (712) 234-3908

  • Analytical & Consulting Services

    Sergeant Bluff, IA · about 9 miles

    Certified for bacteria, nitrate

    (712) 943-4888

  • Foundation Analytical Laboratory

    Cherokee, IA · about 45 miles

    Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, PFAS

    (712) 225-6989

State Hygienic Laboratory at the University of Iowa: Through the Grants-to-Counties program, private well owners in participating counties can have their water tested for total coliform bacteria and nitrate. Start with the county sanitarian at your county health department. No cost in a participating county. The Grants-to-Counties Program, State Hygienic Lab at the University of Iowa.

All 36 certified labs for Iowa

ZIP codes in Sioux City

Which ZIP codes are in Sioux City: Census 2020 relationship files. Which utilities serve them, and how many people: EPA SDWIS and EPA’s service area map. Each utility’s results: EPA UCMR 5, EPA SDWIS, and EPA’s and the state’s compliance monitoring, as its report lists them. How they are measured: methodology. Certified labs: Iowa DNR, laboratories certified for drinking water; distances from the Census 2020 ZIP code tabulation area gazetteer.

Near Sioux City

Towns nearby with a page of their own.

What to do next