01The verdict: is Waterloo water safe?
Waterloo's tap water meets most EPA standards but has areas that warrant attention. With a grade of A- (89.7/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 2,242 residents using groundwater (wells).
1 unresolved violation on record
EPA records show an open compliance item for this system. Most are administrative, but unresolved items are worth watching.
See what was cited ↓Lead is well under the limit
90th-percentile lead is 3.6 ppb — beneath the 15 ppb federal action level and under the 5 ppb watch threshold.
See the trend ↓Check back after the next refresh
EPA data updates on a rolling basis; we fold in new samples and violations every month.
Get alerts ↓Waterloo's drinking water received a grade of A- (89.7 out of 100), indicating good water quality. The city's 1 water system serves approximately 2,242 residents using groundwater.
Lead levels were measured at 3.6 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.
Waterloo ranks #57 out of 402 cities in Indiana for water quality, placing it above average in the state. Waterloo 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, Waterloo may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
02What's in Waterloo's water
Every contaminant flagged in Waterloo, on one shared scale: distance to its own legal limit. The red line is the limit — anything past it is out of compliance, and the closer a bar gets, the less headroom the system has.
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. | 3.6 | 15 | ppb | Inorganic | Safe |
Cities ranked by 90th-percentile lead PF PFAS in Indiana
Cities ranked by compounds detected Cu Copper in Indiana
Cities ranked by 90th-percentile copper
03Waterloo's ten-year track record
Each box is one year. A green check means no EPA violations; a numbered badge counts that year's violations — red if any were health-based, amber if they were monitoring or paperwork issues. The system has 3 violations on record, including 1 health-based violation. 1 remains unresolved.
All ten of the last ten years were clean — no EPA violations recorded for Waterloo.
▼ Down 0.40 ppb since 1993. Latest reading: 3.6 ppb (2024) — 24% of the action level. Sampled at higher-risk homes (90th percentile).
04Where Waterloo's water comes from
Waterloo's drinking water is drawn from underground aquifers through wells.
Groundwater
Underground aquifers reached by wells — naturally filtered, but can carry minerals like arsenic and nitrate.
Local treatment
Groundwater generally needs less treatment — typically disinfection and, where needed, mineral removal.
1 system
1 water system, operated under local government ownership.
2,242 people
Residents served across Waterloo's service area.
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 2,242 people through 1 water system.
| System name | PWSID | Population | Source |
|---|---|---|---|
| WATERLOO WATER WORKS | IN5217007 | 2,242 | Groundwater |
Water bodies near Waterloo
These water bodies shape the regional watershed and can indirectly affect groundwater quality.
05Pressure on Waterloo's watershed
Outside forces that shape what reaches the treatment plant. None of these is a verdict on the tap by itself — but each adds pressure worth knowing about.
Industrial discharge
5 facilities within 10 miles reported 221 lb released to surface water in the latest EPA Toxics Release Inventory. Proximity doesn't equal tap contamination — treatment and hydrology decide — but it's pressure on the watershed.
Flood & storm history
2 federal disaster declarations on record for Steuben County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
06How Waterloo compares
Scores for nearby Indiana cities on one line, with the average marked.
dashed line = Indiana average (71/100)
Waterloo scores 89.7/100 — above the Indiana average of 71/100. It outscores 8 of 10 nearby cities. Full Indiana rankings →
65.8 / 100DFort Wayne, IN
49.5 / 100AGary, IN
92.9 / 100BMerrillville, IN
72.1 / 100AEvansville, IN
85.2 / 100FSouth Bend, IN
39.3 / 100
Compare all cities in the county — grades, violations, and contaminant data side by side.→
07What to do at home
Steps matched to what testing actually found in Waterloo's water — not generic advice.
A basic carbon filter still helps
Waterloo's water meets federal standards, but a simple carbon filter improves taste and adds a margin of safety against short-term issues.
Compare tested filters →Flush taps & check your service line
Lead leaches from pipes as water sits. Run cold water 30 seconds before drinking (especially mornings), and ask the utility whether your address still has a lead service line.
Lead risks explained →Watch for Waterloo alerts
We refresh EPA data monthly and surface new violations, advisories, and boil-water notices for your county on this page.
All water alerts →Frequently asked questions
Is Waterloo, IN tap water safe to drink?
Waterloo's water quality earned a grade of A- (89.7/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #57 out of 402 cities tested in Indiana.
What contaminants are in Waterloo's water?
Lead was measured at 3.6 ppb (90th percentile). 3 violations are on record.
How is Waterloo'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 Waterloo?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Waterloo's water come from?
Waterloo's water is sourced from Groundwater. The city has 1 water system serving approximately 2,242 residents.
What health violations has Waterloo's water system had?
Waterloo has 1 health-based violation on record. The most recent violation was recorded in November 2005. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 1 violation remains unresolved.
Is Waterloo's groundwater at risk of contamination?
Waterloo 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 Waterloo's water compare to other cities?
Waterloo ranks #57 out of 402 cities in Indiana (better than 86% of state cities) and #2637 out of 15382 cities nationally (83th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Waterloo's small water system affect quality?
Waterloo's system serves approximately 2,242 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.