Is Delphi, IN Tap Water Safe to Drink?
Graded C+ — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
66.1/100
waterverge.com Delphi, IN — Water Quality Report
Delphi's drinking water received a grade of C+ (66.1 out of 100), indicating fair water quality. The city's 1 water system serves approximately 3,200 residents using groundwater.
Lead levels were measured at 1.7 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 72 violations on record, including 1 health-based violation. 7 remain unresolved.
What to know about Delphi's water
Delphi ranks #350 out of 414 cities in Indiana for water quality, placing it among the lowest-rated in the state.
Delphi 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, Delphi may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 27 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Delphi, IN water safe to drink?
Delphi's drinking water has significant quality concerns based on EPA testing data. With a grade of C+ (66.1/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 3,200 residents using groundwater (wells).
Recent water quality updates for Delphi
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Delphi's water quality assessment. Grade: C+ (66.1/100).
Contaminants: Toxaphene, Diquat, Endothall.
Contaminants: TTHM, Total Haloacetic Acids (HAA5).
Federal disaster declaration (FEMA DR-4363). Flood event — may have impacted local water infrastructure.
Contaminants: Di(2-ethylhexyl) adipate, OXAMYL, Simazine.
Federal disaster declaration (FEMA DR-3238). Hurricane event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Delphi'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
Delphi's water system has 72 total violations on record, including 1 health-based violation. 7 remain unresolved. 27 violations were issued in the last 5 years.
Flood & environmental risk
Carroll County has experienced 3 federally declared disasters since 1991. 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 Wabash River, Deer Creek, Tippecanoe River Below Oakdale Dam, Tippecanoe River, Wildcat Creek.
Where does Delphi's water come from?
Delphi's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 3,200 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Wabash River (river), Deer Creek (river), Tippecanoe River Below Oakdale Dam (river), Tippecanoe River (river), Wildcat Creek (river).
What Delphi residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Delphi's water.
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.
Delphi'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 Delphi
Industrial polluters nearby
Reported releases to surface water by facilities near Delphi, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
INDIANA PACKERS CORP DELPHI, IN46923 | — | — | 1.7 mi |
ALLOY CUSTOM PRODUCTS LLC LAFAYETTE, IN47905 | — | — | 2.5 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Carroll County has experienced 3 federally declared disasters since 1991. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Recommended water filters
Based on contaminants detected in Delphi'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. | 1.7 | 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. | 2.06 | 1.3 | mg/L | Inorganic | Over Limit |
Lead level trend (90th percentile)
Copper level (90th percentile)
Latest reading: 2.060 mg/L (2002)
EPA action level: 1.3 mg/L
See how Delphi compares by contaminant
Explore where Delphi ranks among all Indiana cities for specific contaminants.
Water source & infrastructure
Where Delphi's water comes from
Delphi'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 3,200 people through 1 water system.
Water bodies near Delphi
Delphi is located near 5 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Delphi
| System Name | PWSID | Population | Source |
|---|---|---|---|
| DELPHI WATER WORKS | IN5208002 | 3,200 | GW |
How Delphi compares
Full Indiana rankings →Delphi's score of 66.1/100 is on par with the average of 70/100 among major Indiana cities. It outscores 4 of 10 nearby cities. 6 of 10 nearby cities score higher.
Nearby cities
View Indiana rankings →About Delphi, IN
Wikipedia →Delphi is a city in and the county seat of Carroll County, in the U.S. state of Indiana. Located twenty minutes northeast of Lafayette, it is part of the Lafayette, Indiana Metropolitan Statistical Area. The population was 2,961 at the 2020 census.
Learn more about your water
Guides and resources related to Delphi's water quality findings.
Explore water quality across Carroll
Frequently asked questions
Is Delphi, IN tap water safe to drink?
Delphi's water quality earned a grade of C+ (66.1/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #350 out of 414 cities tested in Indiana.
What contaminants are in Delphi's water?
Lead was measured at 1.7 ppb (90th percentile). 72 violations are on record.
How is Delphi'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 Delphi?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Delphi's water come from?
Delphi's water is sourced from Groundwater. The city has 1 water system serving approximately 3,200 residents.
What health violations has Delphi's water system had?
Delphi has 1 health-based violation on record. The most recent violation was recorded in April 2023. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 7 violations remain unresolved.
Is Delphi's groundwater at risk of contamination?
Delphi 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 72 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 Delphi's water compare to other cities?
Delphi ranks #350 out of 414 cities in Indiana (better than 15% of state cities) and #11418 out of 15744 cities nationally (28th percentile). The grade of C+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Delphi's small water system affect quality?
Delphi's system serves approximately 3,200 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 72 violations on record.