Water quality
Florida water quality
According to the Environmental Working Group (EWG) and water-industry reporting, Florida's most widespread drinking-water characteristic is very hard water, because groundwater dissolves calcium and magnesium as it moves through the state's limestone aquifers. EWG's Tap Water Database also reports trace detections of contaminants such as trihalomethanes, arsenic, and PFAS in various Florida systems, generally within federal legal limits but above EWG's stricter health-based guidelines. Most systems meet federal standards, with hardness being primarily an aesthetic and scale issue rather than a health risk.
Documented considerations
Hardness
According to water-industry analyses, Florida groundwater is often very hard because it percolates through limestone, picking up calcium and magnesium; several Florida cities report hardness above 7 grains per gallon, with Miami among the hardest.
Arsenic
According to EWG Tap Water Database entries, arsenic occurs naturally in some Florida groundwater (such as the Biscayne Aquifer) and has been detected in systems at levels below the 10 ppb federal limit but above EWG's health-based guideline.
PFAS
According to EWG and state reporting, PFAS have been detected in some Florida water sources, with localized exposure tied to landfills and firefighting-foam training sites.
Disinfection byproducts
According to EWG's Tap Water Database, total trihalomethanes from chlorination are commonly detected in Florida systems, generally within legal limits but above EWG's health guidelines.
EPA compliance snapshot
From the EPA ECHO Safe Drinking Water Act database, Florida community water systems carrying one or more violations on record:
Most common violation categories
- Revised Total Coliform Rule (505)
- E. Coli (463)
- Nitrate (255)
- Lead and Copper Rule (132)
- Consumer Confidence Rule (93)
- Total Haloacetic Acids (HAA5) (93)
Counts are public EPA ECHO figures. 'Health-based' means a system carries at least one health-based violation flag in ECHO. A violation on record is not a statement that current tap water is unsafe; most systems return to compliance. Always check your utility's Consumer Confidence Report for current status. Source: EPA ECHO, retrieved 2026-06-01.
Certified filters for Florida's main concerns
- 7.2AquaTru Classic Countertop RO
A no-plumbing countertop 4-stage RO purifier certified to NSF standards for lead, PFAS, fluoride and arsenic with an efficient drain ratio.
- 7.5Culligan US-EZ-4 Under-Sink
An under-sink filter genuinely IAPMO certified to NSF/ANSI 42, 53 and 401 for lead, cysts, VOCs, mercury and PFOA/PFOS.
- 7.2Aquasana AQ-5200 Under-Sink
Certified for lead and PFAS, cheap per gallon, marketing matches the certified scope.
- 4.9ZeroWater 5-Stage Pitcher (7-Cup)
A five-stage ion-exchange pitcher certified for lead, chromium-6 and PFOA/PFOS - but a short 15-gallon filter makes it costly to run.
FAQ
- Why is Florida water so hard?
- According to water-industry analyses, Florida's groundwater flows through limestone aquifers and dissolves calcium and magnesium, producing very hard water in much of the state. Hardness is mainly an aesthetic and scale concern rather than a health risk, but many residents use softeners or scale-reduction systems.
- Is there arsenic in Florida tap water?
- According to EWG's Tap Water Database, arsenic occurs naturally in some Florida groundwater and has been detected in certain systems at levels below the federal 10 ppb limit but above EWG's stricter health-based guideline. Private well owners in affected areas may want to test for arsenic.
- Is Florida tap water safe to drink?
- Most Florida public water systems meet federal Safe Drinking Water Act standards. According to EWG, the most commonly reported issues are hard water plus trace, legally-compliant detections of trihalomethanes, arsenic, and PFAS, so a filter choice depends on your specific local report.
Sources
Not sure how to read your local report? See our guide on reading a water quality report.