Seminole County, FL
County water overview
Seminole County splits between Seminole County Environmental Services and the city systems in Sanford, Altamonte Springs, Oviedo, Winter Springs, Lake Mary, Longwood, and Casselberry. Rural east Seminole is largely private well.
14
Cities mapped
59
Neighborhoods
10
Water systems
July 29, 2026
Data reviewed
Cities
Pick your city, then your neighborhood.
Geneva
66/100Geneva is largely unincorporated and served by private wells drawing directly from the Floridan Aquifer. Expect hard water with notable iron and sulfur (rotten-egg odor), and no chlorine residual to control bacteria — annual well testing and whole-home treatment are strongly recommended.
2 neighborhoods mapped
View reportBlack Hammock
66/100Black Hammock is largely unincorporated and served by private wells drawing directly from the Floridan Aquifer. Expect hard water with notable iron and sulfur (rotten-egg odor), and no chlorine residual to control bacteria — annual well testing and whole-home treatment are strongly recommended.
1 neighborhoods mapped
View reportMidway
65/100Midway is served by a patchwork of municipal connections and private wells, both drawing on the Floridan Aquifer. Hardness runs high throughout, with well-fed pockets showing more iron and sulfur than city-served streets.
1 neighborhoods mapped
View reportChuluota
62/100Chuluota is largely unincorporated and served by private wells drawing directly from the Floridan Aquifer. Expect hard water with notable iron and sulfur (rotten-egg odor), and no chlorine residual to control bacteria — annual well testing and whole-home treatment are strongly recommended.
3 neighborhoods mapped
View reportForest City
60/100Forest City is served by a patchwork of municipal connections and private wells, both drawing on the Floridan Aquifer. Hardness runs high throughout, with well-fed pockets showing more iron and sulfur than city-served streets.
2 neighborhoods mapped
View reportAltamonte Springs
59/100Altamonte Springs draws its water from the Floridan Aquifer via City of Altamonte Springs. Hardness runs from moderate to very high citywide, and disinfection byproducts along with hardness scale are the most common resident complaints.
7 neighborhoods mapped
View reportFern Park
59/100Fern Park draws its water from the Floridan Aquifer via Seminole County Utilities. Hardness runs from moderate to very high citywide, and disinfection byproducts along with hardness scale are the most common resident complaints.
2 neighborhoods mapped
View reportCasselberry
57/100Casselberry draws its water from the Floridan Aquifer via City of Casselberry. Hardness runs from moderate to very high citywide, and disinfection byproducts along with hardness scale are the most common resident complaints.
5 neighborhoods mapped
View reportLongwood
56/100Longwood draws its water from the Floridan Aquifer via City of Longwood. Hardness runs from moderate to very high citywide, and disinfection byproducts along with hardness scale are the most common resident complaints.
6 neighborhoods mapped
View reportSanford
55/100Sanford draws its water from the Floridan Aquifer via City of Sanford. Hardness runs from moderate to very high citywide, and disinfection byproducts along with hardness scale are the most common resident complaints.
7 neighborhoods mapped
View reportLake Mary
55/100Lake Mary draws its water from the Floridan Aquifer via City of Lake Mary. Hardness runs from moderate to very high citywide, and disinfection byproducts along with hardness scale are the most common resident complaints.
6 neighborhoods mapped
View reportOviedo
54/100Oviedo draws its water from the Floridan Aquifer via City of Oviedo. Hardness runs from moderate to very high citywide, and disinfection byproducts along with hardness scale are the most common resident complaints.
7 neighborhoods mapped
View reportHeathrow
54/100Heathrow draws its water from the Floridan Aquifer via City of Lake Mary / Seminole County Utilities. Hardness runs from moderate to very high citywide, and disinfection byproducts along with hardness scale are the most common resident complaints.
4 neighborhoods mapped
View reportWinter Springs
52/100Winter Springs draws its water from the Floridan Aquifer via City of Winter Springs. Hardness runs from moderate to very high citywide, and disinfection byproducts along with hardness scale are the most common resident complaints.
6 neighborhoods mapped
View reportThe ranking
The 10 worst-scoring neighborhoods in Seminole County.
Ranked out of 59 mapped neighborhoods, by modeled severity: the serving utility's own reported baseline plus plumbing era, distance from the plant, private-well status, and airport or industrial PFAS proximity.
- 01Chuluota Estates · ChuluotaPrivate wells89score
- 02Geneva Woods · GenevaPrivate wells85score
- 03Historic Downtown Sanford · SanfordCity (City of Sanford)84score
- 04Heathrow (Lake Mary edge) · Lake MaryCity (City of Lake Mary)84score
- 05Alaqua · HeathrowCity (City of Lake Mary / Seminole County Utilities)84score
- 06Lake Harney Shores · GenevaPrivate wells83score
- 07Weathersfield · Altamonte SpringsCity (City of Altamonte Springs)80score
- 08The Preserve at Cross Seminole Trail · Winter SpringsCity (City of Winter Springs)79score
- 09Midway Community · MidwayPrivate wells79score
- 10Historic Downtown Oviedo · OviedoCity (City of Oviedo)78score
Who supplies the water
Public water systems operating in Seminole County.
City of Sanford Utilities
City-operated wells and treatment serving Sanford.
2024 Consumer Confidence Report ↗City of Altamonte Springs Public Works
City-operated system serving Altamonte Springs.
2024 Consumer Confidence Report ↗City of Casselberry Utilities
UnconfirmedCity-operated system serving Casselberry.
City of Lake Mary Public Works
UnconfirmedCity system; some Lake Mary addresses are served by Seminole County Environmental Services instead.
City of Longwood Utilities
UnconfirmedCity-operated system serving Longwood.
City of Oviedo Public Works
City-operated system serving Oviedo; nearby unincorporated areas fall under Seminole County.
2024 Consumer Confidence Report ↗City of Winter Springs Utility Department
UnconfirmedCity-operated system serving Winter Springs.
Seminole County Environmental Services
County system serving most unincorporated Seminole County across multiple separate treatment plants.
2024 Consumer Confidence Report ↗Private well (no public water system)
Homes here draw directly from the Floridan Aquifer through a private well. Private wells are not regulated, not treated, and not tested by any agency — there is no CCR for this address because no one is required to produce one.
City / well mix
UnconfirmedWe have not yet confirmed which public water system serves this address against EPA SDWIS and the operator's own service-area map.
Every number on the city and neighborhood pages traces back to one of these systems. See our full sources & methodology.