Dubuque Tap Water Quality Report
Dubuque's water has 3 contaminants above EPA MCLGs. Consider using a certified water filter for additional protection.
4 other systems serving parts of Dubuque report results above guidelines — check which system bills you. REGENCY WEST SUBDIVISION (1 above guidelines), GAVIN ESTATES (2 above guidelines), TABLE MOUND PARK (3 above guidelines), STAR WATER (1 above guidelines)
People Served
59,667
Health-based violations since 2020
0
DUBUQUE WATER WORKS. EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Latest sample on file
Jun 2025 · DUBUQUE WATER WORKS
Utilities publish newer results in their annual water quality report (Consumer Confidence Report).
Is Dubuque Tap Water Safe to Drink?
We recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems. Dubuque's water has 3 contaminants above EPA health-based guidelines (MCLGs), while it meets federal legal limits.
DUBUQUE WATER WORKS, Dubuque's water system, serves 59,667 people. 6 other systems also serve parts of Dubuque. Each system's results are listed under its own name, never added to DUBUQUE WATER WORKS's. Water quality testing is conducted regularly and reported to the EPA. The latest sample on file for DUBUQUE WATER WORKS is from Jun 2025.
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in Iowa
Dubuque Water Service Areas
What these numbers actually mean for Dubuque, IA
We read Dubuque, IA’s published record and send you a short report — which findings warrant a decision, which to ignore, and what to do about it. Including when the answer is nothing.
- 3 contaminants above EPA MCLGs and 2 contaminants with an EPA health goal detected in some samples (no level on file)
- 38 results on file
- 23 PFAS compounds on record
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Recommended Water Filters for Dubuque
Based on Dubuque's water quality data, these NSF-certified filters are recommended to remove contaminants above EPA MCLGs.
Culligan
ZeroWater
NSF Certified:
Flow Rate
1.9 gpm
Daily Production
1 gpd
Highlights:
- Compact design
- Easy to set up
- Affordable
- NSF-42, NSF-53, NSF-401 certified
Removes 19 contaminants:
+14 more
Strontium, Molybdenum, Fluoride, Uranium, Lead, Total PFAS, Chlorine, 25, Phosphorus, Bicarbonate, Calcium, Carbonate, Magnesium, Sodium
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:
Waterdrop
A1
NSF Certified:
Flow Rate
1 gpm
Highlights:
- Performance certified
- Lower price than Philips
- Hot water dispensing
- Compact design
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
Verify Your Water Quality with Independent Testing
With 3 contaminants above EPA MCLGs and 2 contaminants with an EPA health goal detected in some samples (no level on file), independent laboratory testing provides a second opinion and can track changes over time.
SimpleLab
Advanced Home Water Test
$269
Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.
Tap Score
Haloacetic Acids (HAA9) Test
$275
Tests for disinfection byproducts formed when chlorine reacts with organic matter in water treatment.
Tap Score
PFAS Forever Chemicals Test
$339.95
Specialized test for PFOA, PFOS, and 24 other forever chemicals. Essential for areas near military bases, airports, or industrial sites.
With 3 contaminants above health guidelines, you may want to explore water purification options. Learn how to make distilled water at home for applications like humidifiers, CPAP machines, and baby formula.
What Dubuque's water readings can explain
Utility-reported data for Dubuque includes a chlorine-based disinfectant — the readings behind these common tap water questions. We publish a city-level hardness figure for Dubuque, 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 Dubuque? Public-water results do not apply to private wells. See Dubuque County well water testing and USGS risk data — modeled arsenic, nitrate, and the tests to run.
Water softener cost and installation in Dubuque
Dubuque's tap water has an estimated 11.4 grains per gallon (195.0 mg/L, county sampling in Dubuque 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 11.4 gpg water in Dubuque — 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 Iowa as a whole, read water softener cost in Iowa — priced against the plumber wage published for the state.
Frequently Asked Questions About Dubuque Tap Water
Dubuque's water has 3 contaminants above EPA MCLGs. While the water meets federal legal limits, we recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems.
Spotted something off on this page?
Residents keep our data honest.
This form corrects our data; it does not reach DUBUQUE WATER WORKS. For a problem with your water now (discolored water, no water, low pressure, a leak), contact DUBUQUE WATER WORKS directly.
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