Is Corsica, SD Tap Water Safe to Drink?
Graded B+, with 7 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
84.5/100
waterverge.com Corsica, SD — Water Quality Report
Corsica's drinking water received a grade of B+ (84.5 out of 100), indicating good water quality. The city's 1 water system serves approximately 561 residents using purchased surface water.
Lead levels were measured at 5.0 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 18 violations on record, including 5 health-based violations. 7 remain unresolved.
What to know about Corsica's water
Corsica ranks #79 out of 141 cities in South Dakota for water quality, placing it below average in the state.
The city draws from surface water sources, which are more susceptible to seasonal runoff and agricultural contamination, requiring extensive multi-barrier treatment including coagulation, filtration, and disinfection.
As a small community water system, Corsica may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Corsica, SD water safe to drink?
Corsica's drinking water has significant quality concerns based on EPA testing data. With a grade of B+ (84.5/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 561 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Corsica
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Corsica's water quality assessment. Grade: B+ (84.5/100).
Federal disaster declaration (FEMA DR-4807). Flood event — may have impacted local water infrastructure.
Contaminants: Revised Total Coliform Rule.
Contaminants: Lead and Copper Rule.
Federal disaster declaration (FEMA DR-4440). Flood event — may have impacted local water infrastructure.
Contaminants: Total Haloacetic Acids (HAA5), TTHM.
Key contaminant findings
Based on the most recent EPA sampling data for Corsica's water supply.
Well within EPA limits.
Violation history
Corsica's water system has 18 total violations on record, including 5 health-based violations. 7 remain unresolved. 2 violations were issued in the last 5 years.
Flood & environmental risk
Douglas County has experienced 7 federally declared disasters since 1986. 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 Corsica's water come from?
Corsica's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 1 water system serving approximately 561 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment.
What Corsica residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Corsica'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.
Run cold water for 30 seconds before drinking, especially in the morning. Lead and copper leach from household plumbing when water sits in pipes.
Corsica'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 Corsica
Industrial polluters nearby
Reported releases to surface water by facilities near Corsica, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
DAKOTA MFG CO INC CORSICA, SD57328 | — | — | 0.6 mi |
CHS FARMERS ALLIANCE - CORSICA FEED CORSICA, SD57328 | — | — | 0.1 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Drought conditions
D2 — severe droughtDouglas County is currently in D2 (severe 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.
Flood & disaster history
Douglas County has experienced 7 federally declared disasters since 1986. 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. | 5.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Corsica compares by contaminant
Explore where Corsica ranks among all South Dakota cities for specific contaminants.
Water source & infrastructure
Where Corsica's water comes from
Corsica's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Surface water systems require multi-stage treatment including coagulation, sedimentation, filtration, and disinfection to meet EPA Safe Drinking Water Act standards.
These sources can be impacted by seasonal changes, stormwater runoff, upstream agriculture, and industrial discharge.
The system is operated by local government ownership and serves approximately 561 people through 1 water system.
Water systems serving Corsica
| System Name | PWSID | Population | Source |
|---|---|---|---|
| CORSICA | SD4600097 | 561 | SWP |
How Corsica compares
Full South Dakota rankings →Corsica's score of 84.5/100 is above the average of 66/100 among major South Dakota cities. It outscores 6 of 10 nearby cities.
Nearby cities
View South Dakota rankings →About Corsica, SD
Wikipedia →Corsica is a city in Douglas County, South Dakota, United States. The population was 561 at the 2020 census.
Learn more about your water
Guides and resources related to Corsica's water quality findings.
Explore water quality across Douglas
Frequently asked questions
Is Corsica, SD tap water safe to drink?
Corsica's water quality earned a grade of B+ (84.5/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #79 out of 141 cities tested in South Dakota.
What contaminants are in Corsica's water?
Lead was measured at 5.0 ppb (90th percentile). 18 violations are on record.
How is Corsica'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 Corsica?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Corsica's water come from?
Corsica's water is sourced from Purchased surface water. The city has 1 water system serving approximately 561 residents.
What health violations has Corsica's water system had?
Corsica has 5 health-based violations on record. The most recent violation was recorded in May 2024. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 7 violations remain unresolved.
How does Corsica's water compare to other cities?
Corsica ranks #79 out of 141 cities in South Dakota (better than 44% of state cities) and #5885 out of 15744 cities nationally (63th percentile). The grade of B+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Corsica's small water system affect quality?
Corsica's system serves approximately 561 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 18 violations on record.