What contaminants are in Sioux City's water?

Sioux City's water utility tests for 89 different contaminants. Currently, 7 contaminants are above EPA MCLGs. You can view detailed information about each contaminant, including test results, health effects, and comparisons to EPA MCLGs in the sections above.

Do I need a water filter in Sioux City?

Yes, we recommend using a water filter in Sioux City. With 7 contaminants above EPA MCLGs, a certified water filter can reduce your exposure to these substances. Look for filters certified for NSF-53 (health effects) or NSF-58 (reverse osmosis) that specifically remove the contaminants found in your water.

What are the MCL violations in Sioux City?

SIOUX CITY WATER SUPPLY has reported 2 Maximum Contaminant Level (MCL) violations in recent years. MCL violations occur when contaminant levels exceed federal legal limits. While utilities work to resolve these violations, we recommend using a certified water filter during this time for added protection.

Is Sioux City's water hard or soft?

Sioux City's water has 183 PPM average hardness. Soft water is generally easier on plumbing and appliances, and requires less soap for cleaning.

What are the main contaminants in Sioux City tap water?

The main contaminants of concern in Sioux City's tap water include Perfluorooctanoic acid, Perfluorooctanesulfonic acid, Bromoform. These substances were found above EPA health-based guidelines. You can view detailed information about each contaminant, including health effects and recommended filters, in the contaminants section above.

Can you drink tap water in Sioux City?

While you can technically drink tap water in Sioux City as it meets legal requirements, 7 contaminants are above EPA health guidelines. We recommend using a certified water filter for optimal protection, especially for vulnerable individuals.

How often is Sioux City's water tested?

SIOUX CITY WATER SUPPLY is required by federal law to test water quality regularly. The frequency depends on the contaminant - some are tested daily (like bacteria), while others are tested monthly, quarterly, or annually. The test results shown on this page are from the most recent testing period reported to the EPA.

Where does Sioux City's tap water come from?

Sioux City's drinking water comes from groundwater under influence of surface water. Surface water sources include rivers, lakes, and reservoirs, which require more extensive treatment to remove sediments and potential contaminants. The utility treats this water using conventional, filtration before distribution.

What is the overall water quality in Sioux City?

Sioux City has 7 contaminants above EPA health guidelines (MCLGs) out of 89+ tested. While meeting federal legal limits (MCLs), the presence of contaminants above health-based guidelines suggests that using a certified water filter could provide additional protection, especially for sensitive populations.

What are the most common contaminants detected in Sioux City water?

The most commonly detected contaminants in Sioux City water include: Carbon, Dissolved Organic Carbon, Perfluorooctanoic acid, Perfluorooctanesulfonic acid, Bromoform. Of these, 7 exceed EPA health guidelines. These contaminants are regularly monitored by SIOUX CITY WATER SUPPLY and reported to the EPA. View the detailed contaminant section above for specific levels and health information.

Sioux City Tap Water Quality Report

Sioux City's water has 7 contaminants above EPA MCLGs. We recommend using a certified water filter.

Utility

SIOUX CITY WATER

People Served

85,797

MCL Violations

Last Updated

2025-05-14

Is Sioux City Tap Water Safe to Drink?

Sioux City's water has 7 contaminants above EPA health-based guidelines. We strongly recommend using a certified water filter to reduce exposure to these contaminants. Check our filter recommendations below for NSF-certified options that can remove the specific contaminants found in Sioux City's water.

The data below shows test results from 1 water utility serving 85,797 people in the Sioux City area. Water quality testing is conducted regularly and reported to the EPA. This report was last updated 2025-05-14.

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Sioux City Water Service Areas

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Recommended Water Filters for Sioux City

Based on Sioux City's water quality data, these NSF-certified filters are recommended to remove contaminants above EPA MCLGs.

Our Pick

EDITOR'S CHOICE

BEST OVERALL PERFORMANCE

AquaTru

Classic

449

NSF Certified:

NSF-42

NSF-53

NSF-58

NSF-401

NSF-P473

NSF-372

Flow Rate

0.04 gpm

Daily Production

600 gpd

Removes 23 contaminants:

83+, Lead, Fluoride, Strontium, Uranium +18 more

View Details

Highly Rated

EDITOR'S CHOICE

BEST EFFICIENCY

AquaTru

Carafe

349

NSF Certified:

NSF-53

NSF-42

NSF-58

NSF-401

NSF-372

NSF-P473

Flow Rate

0.3 gpm

Daily Production

4 gpd

Removes 17 contaminants:

PFOA, PFOS, Chlorine, Lead, Fluoride +12 more

View Details

Best Value

Waterdrop

G3 P600

(135 reviews)

109.99

NSF Certified:

NSF-58

Flow Rate

600 gpm

Daily Production

600 gpd

Removes 4 contaminants:

Lead, Fluoride, Arsenic, Total Dissolved Solids

View Details

Highly Rated

BEST BEST TANKLESS RO FILTRATION SYSTEM FOR SMALL SPACES

Waterdrop

G3 P800

999

NSF Certified:

NSF-42

NSF-53

NSF-58

NSF-372

Flow Rate

800 gpm

Daily Production

800 gpd

Removes 15 contaminants:

10+ contaminants, Fluoride, Lead, Arsenic, 1,000+ +10 more

View Details

Browse All Water Filter Types

Verify Your Water Quality with Independent Testing

With 7 contaminants above EPA health guidelines, independent laboratory testing provides a second opinion and can track changes over time.

RECOMMENDED

SimpleLab

Advanced Home Water Test

$369

Most comprehensive home water test including all standard tests plus additional parameters for ultimate peace of mind.

(19 reviews)

7-10 days

300+ tested

EPA Certified

Tests 300+ parameters

Most thorough analysis available

EPA-certified laboratory

Order Test Kit

SimpleLab

Standard Home Water Test

$232

Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.

(209 reviews)

7-10 days

200+ tested

EPA Certified

Tests 200+ contaminants

EPA-certified laboratory

Easy mail-in sample collection

Order Test Kit

Tap Score

PFAS Forever Chemicals Test

$239

Specialized test for PFOA, PFOS, and 24 other forever chemicals. Essential for areas near military bases, airports, or industrial sites.

(24 reviews)

7-10 days

26+ tested

EPA Certified

Tests for 26 PFAS compounds

Detects down to EPA's 4 ppt limit

Critical for high-risk areas

Order Test Kit

EPA-Certified Labs

7-10 Day Results

Easy Mail-In Collection

Browse All Test Kits

Frequently Asked Questions About Sioux City Tap Water

Sioux City's water has 7 contaminants above EPA MCLGs. We strongly recommend using a certified water filter to reduce exposure to these contaminants. Check our filter recommendations below for NSF-certified options that can remove the specific contaminants found in Sioux City's water.

Sioux City Tap Water Quality Report

Is Sioux City Tap Water Safe to Drink?

Sioux City Water Service Areas

Recommended Water Filters for Sioux City

Classic

Carafe

G3 P600

G3 P800

Browse All Water Filter Types

Verify Your Water Quality with Independent Testing

Advanced Home Water Test

Standard Home Water Test

PFAS Forever Chemicals Test

Frequently Asked Questions About Sioux City Tap Water

Is Sioux City tap water safe to drink?

What contaminants are in Sioux City's water?

Do I need a water filter in Sioux City?

What are the MCL violations in Sioux City?

Is Sioux City's water hard or soft?

What are the main contaminants in Sioux City tap water?

Can you drink tap water in Sioux City?

How often is Sioux City's water tested?

Where does Sioux City's tap water come from?

What is the overall water quality in Sioux City?

What are the most common contaminants detected in Sioux City water?

Stay Informed About Your Water Quality