Is SIOUX CITY WATER SUPPLY Water Safe to Drink in 2026?
Iowa · PWSID IA9778054 · Surface water
Population served
85,791
Cities served
SIOUX CITY
State / jurisdiction
Iowa (IA)
PWSID
IA9778054
F
TAP WATER GRADE
High risk
Model score 0/88 from violations, PFAS profile, and monitoring signals — not a laboratory test of your faucet.
133 violation record(s) in the latest EPA SDWA quarterly snapshotPFAS above EPA MCL (UCMR5 regulated compounds)
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CONTAMINANTS — EPA UCMR5 MONITORING
Compound
Level (ppt)
EPA limit
Health guideline
Status
PFHxSregulated
35.0
10 ppt
Exceeds
Above health advisory
PFHxA
33.0
—
Within / n/a
Unregulated (monitored)
PFPeA
22.0
—
Within / n/a
Unregulated (monitored)
PFBS
21.0
—
Within / n/a
Unregulated (monitored)
PFPeS
14.0
—
Within / n/a
Unregulated (monitored)
PFBA
9.2
—
Within / n/a
Unregulated (monitored)
PFOAregulated
6.0
4 ppt
Exceeds
Above health advisory
PFHpA
4.8
—
Within / n/a
Unregulated (monitored)
PFOSregulated
4.3
4 ppt
Exceeds
Above health advisory
Source: EPA UCMR5 · ppt = parts per trillion · MCL = enforceable limit for regulated PFAS
VIOLATIONS HISTORY (FEDERAL SNAPSHOT)
EPA’s national SDWA quarterly files associate 133 violation-related records with this system in the same reporting quarter as the utility snapshot used on WaterCheckup. This is not a complete historical docket — see ECHO and SDWIS for full compliance context.
WHY THIS FOR SIOUX CITY WATER SUPPLY · Chosen for SIOUX CITY WATER SUPPLY because PFAS was detected at 35 ppt in UCMR5 — above the 4 ppt limit for some regulated compounds — and this system shows 133 violation record(s) in the latest federal snapshot. RO removes 99%+ of PFAS at the tap.
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