Is Postville, IA Tap Water Safe to Drink?
Graded A-, with 1 unresolved violation on record. See what was cited — and what it means for your tap. What to do next ↓
86.6/100
waterverge.com Postville, IA — Water Quality Report
Postville's drinking water received a grade of A- (86.6 out of 100), indicating good water quality. The city's 1 water system serves approximately 2,513 residents using groundwater.
Lead levels were measured at 9.9 ppb (90th percentile), which is within EPA limits but above recommended levels. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 8 violations on record, including 0 health-based violations. 1 remains unresolved.
What to know about Postville's water
Postville ranks #319 out of 436 cities in Iowa for water quality, placing it below average in the state.
Postville relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff.
While lead levels are within EPA limits, they are above the recommended 5 ppb threshold that health organizations consider ideal. A point-of-use filter adds an extra layer of protection.
As a small community water system, Postville may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Postville, IA water safe to drink?
Postville's tap water meets most EPA standards but has areas that warrant attention. With a grade of A- (86.6/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 2,513 residents using groundwater (wells).
Recent water quality updates for Postville
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Postville's water quality assessment. Grade: A- (86.6/100).
Federal disaster declaration (FEMA DR-4732). Flood event — may have impacted local water infrastructure.
Contaminants: Revised Total Coliform Rule.
Federal disaster declaration (FEMA DR-4421). Flood event — may have impacted local water infrastructure.
Contaminants: Gross Alpha, Excl. Radon and U.
Contaminants: Nitrate.
Key contaminant findings
Based on the most recent EPA sampling data for Postville's water supply.
Within EPA limits but above the American Academy of Pediatrics recommended level of 1 ppb. An NSF 53-certified filter provides additional protection.
Violation history
Postville's water system has 8 total violations on record, including 0 health-based violations. 1 remain unresolved. 1 violation was issued in the last 5 years.
Flood & environmental risk
Allamakee County has experienced 10 federally declared disasters since 1974. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies.
Where does Postville's water come from?
Postville's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 2,513 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Postville residents can do
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Run cold water for 30 seconds before drinking, especially in the morning. Lead and copper leach from household plumbing when water sits in pipes.
Postville's area has a history of flooding. After severe weather, watch for boil water advisories from your local utility.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Top industrial polluters within 10 miles of Postville
Industrial polluters nearby
Reported releases to surface water by facilities near Postville, ranked by pounds discharged annually.
Total reported releases to surface water: 821,687 lbs
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
AGRI STAR MEAT & POULTRY LLC. POSTVILLE, IA52162 | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 577,258 | 0.2 mi |
PRAIRIE FARMS LUANA, IA52156 | Nitric acid | 244,429 | 6.6 mi |
INDUSTRIAL LAMINATES/NORPLEX LLC POSTVILLE, IA52162 | — | — | 0.7 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Allamakee County has experienced 10 federally declared disasters since 1974. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Recommended water filters
Based on contaminants detected in Postville's water supply, we recommend the following filter types.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 9.9 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Postville compares by contaminant
Explore where Postville ranks among all Iowa cities for specific contaminants.
Water source & infrastructure
Where Postville's water comes from
Postville's drinking water is drawn from underground aquifers through wells.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals.
Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds.
The system is operated by local government ownership and serves approximately 2,513 people through 1 water system.
Water systems serving Postville
| System Name | PWSID | Population | Source |
|---|---|---|---|
| POSTVILLE WATER DEPARTMENT | IA0375053 | 2,513 | GW |
How Postville compares
Full Iowa rankings →Postville's score of 86.6/100 is above the average of 72/100 among major Iowa cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Iowa rankings →About Postville, IA
Learn more about your water
Guides and resources related to Postville's water quality findings.
Explore water quality across Allamakee
Frequently asked questions
Is Postville, IA tap water safe to drink?
Postville's water quality earned a grade of A- (86.6/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #319 out of 436 cities tested in Iowa.
What contaminants are in Postville's water?
Lead was measured at 9.9 ppb (90th percentile). 8 violations are on record.
How is Postville's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Postville?
While lead levels are within EPA limits, a filter adds extra protection. Based on current data, basic filtration should suffice for additional peace of mind.
Where does Postville's water come from?
Postville's water is sourced from Groundwater. The city has 1 water system serving approximately 2,513 residents.
Is Postville's groundwater at risk of contamination?
Postville uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 8 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Postville's water compare to other cities?
Postville ranks #319 out of 436 cities in Iowa (better than 27% of state cities) and #4600 out of 15744 cities nationally (71th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Postville's small water system affect quality?
Postville's system serves approximately 2,513 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 8 violations on record.