Is Delmar, 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 ↓
91.2/100
waterverge.com Delmar, IA — Water Quality Report
Delmar's drinking water received a grade of A (91.2 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 542 residents using groundwater.
Lead levels were measured at 2.0 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 3 violations on record, including 1 health-based violation. 1 remains unresolved.
What to know about Delmar's water
Delmar ranks #149 out of 436 cities in Iowa for water quality, placing it mid-range in the state.
Delmar 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.
As a small community water system, Delmar may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Delmar, IA water safe to drink?
Delmar's tap water meets most EPA standards but has areas that warrant attention. With a grade of A (91.2/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 542 residents using groundwater (wells).
Recent water quality updates for Delmar
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Delmar's water quality assessment. Grade: A (91.2/100).
Federal disaster declaration (FEMA DR-4732). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-4421). Flood event — may have impacted local water infrastructure.
1 health-based. Contaminants: Groundwater Rule.
Contaminants: Gross Alpha, Excl. Radon and U.
Key contaminant findings
Based on the most recent EPA sampling data for Delmar's water supply.
Well within EPA limits.
Violation history
Delmar's water system has 3 total violations on record, including 1 health-based violation. 1 remain unresolved.
Flood & environmental risk
Jackson County has experienced 9 federally declared disasters since 1965. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies. Local water sources include North Fork Maquoketa River Near Fulton, Maquoketa River Near Maquoketa.
Where does Delmar's water come from?
Delmar's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 542 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include North Fork Maquoketa River Near Fulton (river), Maquoketa River Near Maquoketa (river).
What Delmar 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.
Delmar'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 Delmar
Industrial polluters nearby
Reported releases to surface water by facilities near Delmar, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
MAQUOKETA CO MAQUOKETA, IA52060 | — | — | 5.2 mi |
HUSCO INTERNATIONAL MAQUOKETA, IA52060 | — | — | 4.0 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Jackson County has experienced 9 federally declared disasters since 1965. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
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. | 2.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Delmar compares by contaminant
Explore where Delmar ranks among all Iowa cities for specific contaminants.
Water source & infrastructure
Where Delmar's water comes from
Delmar'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 542 people through 1 water system.
Water bodies near Delmar
Delmar is located near 2 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Delmar
| System Name | PWSID | Population | Source |
|---|---|---|---|
| DELMAR WATER SUPPLY | IA2328024 | 542 | GW |
How Delmar compares
Full Iowa rankings →Delmar's score of 91.2/100 is above the average of 72/100 among major Iowa cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Iowa rankings →About Delmar, IA
Learn more about your water
Guides and resources related to Delmar's water quality findings.
Explore water quality across Clinton
Frequently asked questions
Is Delmar, IA tap water safe to drink?
Delmar's water quality earned a grade of A (91.2/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #149 out of 436 cities tested in Iowa.
What contaminants are in Delmar's water?
Lead was measured at 2.0 ppb (90th percentile). 3 violations are on record.
How is Delmar'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 Delmar?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Delmar's water come from?
Delmar's water is sourced from Groundwater. The city has 1 water system serving approximately 542 residents.
What health violations has Delmar's water system had?
Delmar has 1 health-based violation on record. The most recent violation was recorded in January 2018. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 1 violation remains unresolved.
Is Delmar's groundwater at risk of contamination?
Delmar 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 3 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 Delmar's water compare to other cities?
Delmar ranks #149 out of 436 cities in Iowa (better than 66% of state cities) and #1847 out of 15744 cities nationally (88th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Delmar's small water system affect quality?
Delmar's system serves approximately 542 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 3 violations on record.