Question 1

Is North Sioux City water safe to drink?

Accepted Answer

North Sioux City (PWS ID: SD4600226) has 69 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 3,042 people using Groundwater sources.

Question 2

How many people does North Sioux City serve?

Accepted Answer

EPA SDWIS reports that North Sioux City serves 3,042 people (this public water system's service population, not the municipal population of North Sioux City or any other city). It is a Local-owned system using Groundwater water sources with 1,249 service connections. The operator address is listed in North Sioux City, South Dakota.

Question 3

What type of violations does North Sioux City have?

Accepted Answer

North Sioux City has 69 total violations: 0 health-based violations (MCL exceedances or treatment failures), 63 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Question 4

Has PFAS been detected in North Sioux City water?

Accepted Answer

No PFAS testing data is available for North Sioux City under the EPA's UCMR5 monitoring program.

Question 5

What water source does North Sioux City use?

Accepted Answer

North Sioux City uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.

Question 6

Where does this data come from?

Accepted Answer

All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

Question 7

Where does North Sioux City sit among U.S. public water systems?

Accepted Answer

According to EPA SDWIS population_served among sitemap-advertised systems (serving 500+), North Sioux City ranks #10,501 of 29,740 by people served, and #49 of 171 in South Dakota. Ordinals use population_served DESC among systems serving 500+ (the sitemap cohort). See /methodology#corpus-placement.

Question 8

How does North Sioux City's violation count compare nationally?

Accepted Answer

North Sioux City has 69 recorded EPA SDWIS violations, fewer than 35% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 65% of that cohort has fewer violations than North Sioux City. A system can have zero recorded violations and still be actively monitored, and a high violation count often reflects a system that reports thoroughly, not necessarily one with worse water.

Contaminant	Category	Count	Latest
Consumer Confidence Rule	Other	4	2003
Lead and Copper Rule	MR	3	1999
1,2-DIBROMO-3-CHLOROPROPANE	MR	2	2008
Carbofuran	MR	2	1996
OXAMYL	MR	2	1996
cis-1,2-Dichloroethylene	MR	2	1999
Vinyl chloride	MR	2	1999
1,1,1-Trichloroethane	MR	2	1999
Tetrachloroethylene	MR	2	1999
Xylenes, Total	MR	2	1999
Carbon tetrachloride	MR	2	1999
CHLOROBENZENE	MR	2	1999
Styrene	MR	2	1999
Benzene	MR	2	1999
p-Dichlorobenzene	MR	2	1999
Trichloroethylene	MR	2	1999
Toluene	MR	2	1999
DICHLOROMETHANE	MR	2	1999
1,2-Dichloropropane	MR	2	1999
1,2-Dichloroethane	MR	2	1999
Ethylbenzene	MR	2	1999
1,1,2-Trichloroethane	MR	2	1999
ETHYLENE DIBROMIDE	MR	2	2008
o-Dichlorobenzene	MR	2	1999
Aldicarb	MR	2	1996
Nitrate	MR	2	1995
1,1-Dichloroethylene	MR	2	1999
1,2,4-Trichlorobenzene	MR	2	1999
Aldicarb sulfone	MR	2	1996
Aldicarb sulfoxide	MR	2	1996

North Sioux City

North Sioux City standing, mid SDWIS violation third

System Details

Violation History

Violation Count vs. the National Corpus

Health-based violations on North Sioux City

Nationwide peers

Cross-state systems near this violation count

Cross-state systems near this population served