Sioux City Water Supply serves 85,791 people from surface water. 31 results are on record. Three PFAS, PFHxS, PFOA and PFOS, are above their federal limits (2024 limits that water systems have until at least 2029 to meet); lithium sits above a screening level.
From the utility's inventory reported to EPA (2026Q2). Look up your address with the utility.
Compliance
3health-based violations in the last 10 years
From EPA SDWIS. Counted once per contaminant per year, as in the Track record score.
Not in this recordDisinfection by-products weren't monitored in this dataset
No result is not a pass. Your utility's annual water quality report may list them, and a certified lab test covers your own tap.
A federal limit (an MCL or action level) is an enforceable legal cap; a health goal is often stricter. Meeting the limit is a compliance fact, not a health clearance, and PurityMap publishes no overall compliance verdict.
What you can do
Test first, then treat what was found
01 · TestTest your own tap
Plumbing inside a home can add lead that the system record can't show. A tap test tells you what reaches your glass.
Each card names which of this system’s findings its current certification covers, and which it doesn’t.
As an Amazon Associate, PurityMap earns from qualifying purchases. A product appears here only when a current certification record covers at least one identified concern; every concern stays listed. The retail offer is looked up afterwards and never changes which products appear or their order. Affiliate disclosure.
Under-Sink Filter
Aquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M)
✓PFOA: eligible, evidence match
✓PFOS: eligible, evidence match
✓Lead: eligible, evidence match
–Not established: PFHxS, Lithium, Perfluorobutanesulfonic acid (PFBS) and 5 more
Not suitable for (5)
Treating every tap in the home
A whole-home hard-water or scale problem
All PFAS: its evidence covers only the compounds it names
Anyone who can't plumb, drill or hire an installer
SIOUX CITY WATER SUPPLY (PWS ID IA9778054) is a public water system serving 85,791 people in Sioux City, Iowa.
Where does SIOUX CITY WATER SUPPLY get its water?
SIOUX CITY WATER SUPPLY is on record as drawing from surface water. The source shapes which contaminants matter most for this system.
What does SIOUX CITY WATER SUPPLY's monitoring record show?
PurityMap's record for SIOUX CITY WATER SUPPLY holds 31 findings: 4 above a reference, 3 detected within the reference, 4 detected with no limit and 20 not detected, from 31 evidence records. Every finding links to its source; a substance that was never monitored is shown as pending, not as a pass.
Is SIOUX CITY WATER SUPPLY's water safe to drink?
PurityMap does not issue a safety verdict. It publishes SIOUX CITY WATER SUPPLY's measured results against each contaminant's benchmark so you can read them in context. Safety depends on the specific finding, your plumbing, and how the water reaches your tap.
How current is this SIOUX CITY WATER SUPPLY data?
The latest published record for SIOUX CITY WATER SUPPLY is dated 2026-09-16. Utilities report on regulatory cycles, so results reflect the monitoring period rather than a live reading.
Does this assessment represent my home's tap water?
No. It is assessed at the water-system level from SIOUX CITY WATER SUPPLY's own monitoring. It does not cover the service line to your building or the plumbing inside it, which can add lead and other metals after the water leaves the system. A tap test is the way to know what reaches your glass.
What contaminants were detected in SIOUX CITY WATER SUPPLY?
Lithium, Perfluorohexanesulfonic acid (PFHxS), Perfluorooctanoic acid (PFOA), Perfluorooctanesulfonic acid (PFOS), Lead (90th percentile), Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA), Perfluorobutanoic acid (PFBA), Perfluoroheptanoic acid (PFHpA), Perfluoropentanesulfonic acid (PFPeS) and Perfluoropentanoic acid (PFPeA) were detected in this record. Each finding shows its measured value, its reference and its source on this page.
What should I do if I'm concerned about PFAS in SIOUX CITY WATER SUPPLY's water?
Start with what the record shows: the PFAS findings above list each measured value against its reference. This record cannot show your home's plumbing, so a tap test tells you what reaches your glass. If you decide to treat your water, look for a filter whose certification covers the specific PFAS compounds in your record; the section "Certified for a concern found here" lists only products with a current certification record for these concerns.
What should I do if I'm concerned about lead in SIOUX CITY WATER SUPPLY's water?
Start with what the record shows: the lead findings above list each measured value against its reference. This record cannot show your home's plumbing, so a tap test tells you what reaches your glass. If you decide to treat your water, look for a filter whose certification covers the specific contaminant in your record; the section "Certified for a concern found here" lists only products with a current certification record for these concerns.
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