Is Calvin, LA Tap Water Safe to Drink?
Graded D, with 96 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
45/100
waterverge.com Calvin, LA — Water Quality Report
Calvin's drinking water received a grade of D (45 out of 100), indicating poor water quality. The city's 1 water system serves approximately 591 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 226 violations on record, including 112 health-based violations. 96 remain unresolved.
What to know about Calvin's water
Calvin ranks #247 out of 309 cities in Louisiana for water quality, placing it among the lowest-rated in the state.
Calvin 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, Calvin may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 38 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Calvin, LA water safe to drink?
Calvin's drinking water has significant quality concerns based on EPA testing data. With a grade of D (45/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 591 residents using groundwater (wells).
Recent water quality updates for Calvin
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Calvin's water quality assessment. Grade: D (45/100).
Contaminants: Public Notice.
1 health-based. Contaminants: Groundwater Rule.
1 health-based. Contaminants: TTHM.
Key contaminant findings
Based on the most recent EPA sampling data for Calvin's water supply.
Well within EPA limits.
Violation history
Calvin's water system has 226 total violations on record, including 112 health-based violations. 96 remain unresolved. 38 violations were issued in the last 5 years.
Where does Calvin's water come from?
Calvin's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 591 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Calvin residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Calvin'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.
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 Calvin
Industrial polluters nearby
Reported releases to surface water by facilities near Calvin, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
JELD-WEN DODSON, LA71422 | — | — | 9.1 mi |
ARCLIN USA LLC DODSON, LA71422 | — | — | 8.9 mi |
HIXSON LUMBER CO LLC WINNFIELD, LA71483 | — | — | 8.2 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Superfund sites within 10 miles of Calvin
Superfund sites nearby
Federally tracked hazardous-waste sites on the EPA National Priorities List. Proximity does not necessarily indicate tap-water contamination — the connection depends on hydrology and treatment.
- AMERICAN CREOSOTE WORKS INC WINNFIELD PLANT8.8 mi
Source: EPA Superfund National Priorities List
Drought conditions
D3 — extreme droughtWinn Parish is currently in D3 (extreme drought) per the U.S. Drought Monitor (week of May 5, 2026). Drought can elevate disinfection-byproduct (TTHM/HAA5) levels and taste/odor issues as utilities draw from lower reservoirs.
Source: U.S. Drought Monitor, updated weekly by NDMC, USDA, and NOAA.
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 Calvin compares by contaminant
Explore where Calvin ranks among all Louisiana cities for specific contaminants.
Water source & infrastructure
Where Calvin's water comes from
Calvin'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 591 people through 1 water system.
Water systems serving Calvin
| System Name | PWSID | Population | Source |
|---|---|---|---|
| VILLAGE OF CALVIN WATER SYSTEM | LA1127002 | 591 | GW |
How Calvin compares
Full Louisiana rankings →Calvin's score of 45/100 is below the average of 53/100 among major Louisiana cities. It outscores 6 of 10 nearby cities.
Nearby cities
View Louisiana rankings →About Calvin, LA
Wikipedia →Calvin is a village in Winn Parish, Louisiana, United States. As of the 2020 census, Calvin had a population of 242.
Learn more about your water
Guides and resources related to Calvin's water quality findings.
Explore water quality across Winn Parish
Frequently asked questions
Is Calvin, LA tap water safe to drink?
Calvin's water quality earned a grade of D (45/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #247 out of 309 cities tested in Louisiana.
What contaminants are in Calvin's water?
Lead was measured at 2.0 ppb (90th percentile). 226 violations are on record.
How is Calvin'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 Calvin?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Calvin's water come from?
Calvin's water is sourced from Groundwater. The city has 1 water system serving approximately 591 residents.
What health violations has Calvin's water system had?
Calvin has 112 health-based violations on record. The most recent violation was recorded in October 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 96 violations remain unresolved.
Is Calvin's groundwater at risk of contamination?
Calvin 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 226 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 Calvin's water compare to other cities?
Calvin ranks #247 out of 309 cities in Louisiana (better than 20% of state cities) and #14310 out of 15744 cities nationally (9th percentile). The grade of D reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Calvin's small water system affect quality?
Calvin's system serves approximately 591 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 226 violations on record.