North Sioux City Tap Water Quality Report
No water-quality test results are on file for North Sioux City. That is a gap in the EPA record we publish, not a finding about the water. Check NORTH SIOUX CITY's latest Consumer Confidence Report for its current test results.
People Served
2,530
Health-based violations since 2020
0
NORTH SIOUX CITY. EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Is North Sioux City Tap Water Safe to Drink?
Everything we hold on North Sioux City's water is below — a thin record, not a clean one. Testing your own water is the way to find out what your tap is actually delivering.
NORTH SIOUX CITY, North Sioux City's water system, serves 2,530 people. 1 other system is listed for North Sioux City. Each system's results are listed under its own name, never added to NORTH SIOUX CITY's.
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in South Dakota
North Sioux City Water Service Areas
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General-Purpose Water Filters for North Sioux City
No test results are on file for NORTH SIOUX CITY, North Sioux City's water system, so these are general-purpose NSF/ANSI 53 certified filters, not chosen for any contaminant.
Pentair Residential Filtration, LLC
Everpure Residential H-300-NXT
NSF Certified:
Capacity
3001 gal
Filter Life
10 mo
Flow Rate
0.5 gpm
Removes 5 contaminants:
Whirlpool Corporation
W11256135
NSF Certified:
Capacity
1001 gal
Filter Life
3 mo
Flow Rate
0.7 gpm
Removes 19 contaminants:
+14 more
Benzene, Carbofuran, Chlorine (Free), Chlorine (Total), Chlorine Dioxide, Chlorobenzene, Cryptosporidium, Ethylbenzene, Lead, Mercury, Metolachlor, Tetrachloroethylene, Toxaphene, Turbidity
Whirlpool Corporation
W11569861
NSF Certified:
Capacity
1001 gal
Filter Life
3 mo
Flow Rate
0.52 gpm
Removes 22 contaminants:
+17 more
Atrazine, Benzene, Carbofuran, Chlorine (Free), Chlorine (Total), Chlorine Dioxide, Chlorobenzene, Cryptosporidium, Ethylbenzene, Lead, Mercury, Metolachlor, Styrene, Tetrachloroethylene, Toxaphene, Trichloroethylene, Turbidity
Santevia
Bath Filter
NSF Certified:
Flow Rate
0.36 gpm
Highlights:
- Organic cotton design reduces plastic used in construction
- Affordable upfront & ongoing cost
- The only bath filter that removed 100% chlorine with “normal” faster faucet flow
Removes 1 contaminants:
Filters for what North Sioux City reported
No test results on file — test your own tap
We don't hold water-quality results for this system yet, so nobody can tell you what is in your water from published data. A certified lab test is the way to find out.
SimpleLab
Advanced Home Water Test
$269
Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.
Tap Score
Advanced Microplastics Test
$829
Cutting-edge testing for microplastics particles in drinking water using advanced laboratory techniques.
Tap Score
Haloacetic Acids (HAA9) Test
$275
Tests for disinfection byproducts formed when chlorine reacts with organic matter in water treatment.
What North Sioux City's water readings can explain
We publish a city-level hardness figure for North Sioux City, resolved from its water systems where they report one and estimated from county sampling where they do not. Each page starts with the hot-tap and cold-tap check, then shows what your own water system reported.
On a private well near North Sioux City? Public-water results do not apply to private wells. See Union County well water testing and USGS risk data — modeled arsenic, nitrate, and the tests to run.
Water softener cost and installation in North Sioux City
North Sioux City's tap water has an estimated 29.6 grains per gallon (506.0 mg/L, county sampling in Union County) — very hard on the USGS scale, the range where scale on fixtures and appliances is the usual complaint.
Water softener cost for an estimated 29.6 gpg water in North Sioux City — equipment and local installation labour for your ZIP code, with the sizing arithmetic shown in full. For the national picture first, read what a water softener costs — equipment, installation labour and ten-year ownership, each separated out. For South Dakota as a whole, read water softener cost in South Dakota — priced against the plumber wage published for the state.
Frequently Asked Questions About North Sioux City Tap Water
No water-quality test results are on file for North Sioux City. That is a gap in the EPA record we publish, not a finding about the water. Check NORTH SIOUX CITY's latest Consumer Confidence Report for its current test results.
Spotted something off on this page?
Residents keep our data honest.
This form corrects our data; it does not reach NORTH SIOUX CITY. For a problem with your water now (discolored water, no water, low pressure, a leak), contact NORTH SIOUX CITY directly.
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