Is Madrid, IA Tap Water Safe to Drink?
Graded A- — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
85.4/100
waterverge.com Madrid, IA — Water Quality Report
Madrid's drinking water received a grade of A- (85.4 out of 100), indicating good water quality. The city's 2 water systems serve approximately 4,725 residents using ground water under influence.
Lead levels were measured at 0.5 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 7 violations on record, including 4 health-based violations. 1 remains unresolved.
What to know about Madrid's water
Madrid ranks #339 out of 436 cities in Iowa for water quality, placing it among the lowest-rated in the state.
Madrid 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.
Water quality score
See methodology →Is Madrid, IA water safe to drink?
Madrid's tap water meets most EPA standards but has areas that warrant attention. With a grade of A- (85.4/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 2 water systems serve approximately 4,725 residents using groundwater (wells).
Recent water quality updates for Madrid
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Madrid's water quality assessment. Grade: A- (85.4/100).
1 health-based. Contaminants: Epichlorohydrin.
Federal disaster declaration (FEMA DR-4421). Flood event — may have impacted local water infrastructure.
1 health-based. Contaminants: TTHM.
Federal disaster declaration (FEMA DR-3239). Hurricane event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Madrid's water supply.
Well within EPA limits.
Exceeds EPA action level. Copper can leach from household plumbing — flush taps for 30 seconds before drinking.
Violation history
Madrid's water system has 7 total violations on record, including 4 health-based violations. 1 remain unresolved. 1 violation was issued in the last 5 years.
Flood & environmental risk
Boone County has experienced 6 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.
Where does Madrid's water come from?
Madrid's drinking water comes from groundwater (wells), supplied by 2 water systems serving approximately 4,725 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Madrid 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.
Madrid'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
Flood & disaster history
Boone County has experienced 6 federally declared disasters since 1965. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Recommended water filters
Based on contaminants detected in Madrid'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. | 0.5 | 15 | ppb | Inorganic | Safe |
| Copper (90th percentile) CopperInorganic A metal that enters drinking water mainly through corrosion of copper plumbing. Small amounts are essential for health, but excess levels are harmful. Health EffectsGastrointestinal distress (nausea, vomiting, diarrhea) at short-term high levels; liver and kidney damage from long-term exposure. EPA Limit1.3 mg/L action level Common SourcesCorrosion of copper household plumbing, erosion of natural deposits. | 1.94 | 1.3 | mg/L | Inorganic | Over Limit |
Lead level trend (90th percentile)
Copper level (90th percentile)
Latest reading: 1.940 mg/L (1993)
EPA action level: 1.3 mg/L
See how Madrid compares by contaminant
Explore where Madrid ranks among all Iowa cities for specific contaminants.
Water source & infrastructure
Where Madrid's water comes from
Madrid'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 4,725 people through 2 water systems.
Water systems serving Madrid
| System Name | PWSID | Population | Source |
|---|---|---|---|
| MADRID WATER DEPARTMENT | IA0848015 | 3,090 | GU |
| XENIA RWD (MADRID) | IA0848701 | 1,635 | GUP |
How Madrid compares
Full Iowa rankings →Madrid's score of 85.4/100 is above the average of 72/100 among major Iowa cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Iowa rankings →About Madrid, IA
Learn more about your water
Guides and resources related to Madrid's water quality findings.
Explore water quality across Boone
Frequently asked questions
Is Madrid, IA tap water safe to drink?
Madrid's water quality earned a grade of A- (85.4/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #339 out of 436 cities tested in Iowa.
What contaminants are in Madrid's water?
Lead was measured at 0.5 ppb (90th percentile). 7 violations are on record.
How is Madrid'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 Madrid?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Madrid's water come from?
Madrid's water is sourced from Ground water under influence. The city has 2 water systems serving approximately 4,725 residents.
What health violations has Madrid's water system had?
Madrid has 4 health-based violations on record. The most recent violation was recorded in June 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 1 violation remains unresolved.
Is Madrid's groundwater at risk of contamination?
Madrid 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 7 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 Madrid's water compare to other cities?
Madrid ranks #339 out of 436 cities in Iowa (better than 22% of state cities) and #5338 out of 15744 cities nationally (66th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.