SIOUX CITY WATER SUPPLY
Sioux City, IA · 85,791 served
SIOUX CITY WATER SUPPLY serves 85,791 people in Sioux City, IA. It has 0 health-based violations in the last 5 years. TapGraded gives this system a C.
Score breakdown
Health-based violations (5y)
0
Monitoring violations (5y)
2
Currently unaddressed
0
Overall score
76/100
Violation history (last 5 years)
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Lead (Lead and Copper Rule)
EPA's current lead action level is 15 ppb (dropping to 10 ppb in 2027 under the Lead and Copper Rule Improvements).
PFAS (UCMR5 occurrence data)
System details
- System type
- Community water system
- Water source
- Ground water under the influence of surface water
- Ownership
- Local government
- Service connections
- 29,424
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Is Sioux City, IA tap water safe to drink?
SIOUX CITY WATER SUPPLY has 0 health-based violations in the last 5 years. TapGraded gives this system a C.
Does SIOUX CITY WATER SUPPLY have lead in its water?
The most recent 90th-percentile lead sample is 2 ppb, versus the EPA action level of 15 ppb.
Has PFAS been detected in SIOUX CITY WATER SUPPLY's water?
Yes — PFAS was detected at or above the EPA MCL for 3 of the tracked analytes.
Source: EPA SDWIS/ECHO · Data as of 2026Q2