Tampa Bay is served by one of the more complex regional water systems in the country. Tampa Bay Water — a wholesale supplier serving Hillsborough, Pasco, and Pinellas counties plus the cities of Tampa, St. Petersburg, and New Port Richey — blends three fundamentally different water sources: treated surface water from the Hillsborough River and Tampa Bypass Canal, treated groundwater from the Floridian Aquifer, and desalinated seawater from a large reverse osmosis plant on Tampa Bay. This blended approach helps manage supply variability in a fast-growing region under increasing drought pressure (a Modified Phase II Water Shortage Order was in effect as of February 2026).
The water meets federal standards. The practical concerns involve elevated disinfection byproducts, PFAS from MacDill Air Force Base contamination in surrounding systems, naturally occurring radium and uranium, and chloramine disinfection that standard carbon filters handle poorly.
The Water Shortage Context
As of February 8, 2026, the Southwest Florida Water Management District enacted a Modified Phase II Water Shortage Order for the Tampa Bay region. Combined with Tampa's existing year-round once-a-week outdoor watering restrictions, this means:
- No HOA or community can require water use increases (including plant replacement)
- Car washing at home limited to your designated watering day only
- Decorative fountains limited to eight hours per day
This is the context in which Tampa Bay Water is managing a 2.5 million person supply. Per capita water use constraints and the reliance on desalination as a backup source aren't hypothetical — they're operational reality now.
PFAS: MacDill AFB and Adjacent System Detections
MacDill Air Force Base sits on a peninsula in Tampa Bay, directly adjacent to the city of Tampa. Decades of AFFF (aqueous film-forming foam) use at MacDill — the standard military fire-training and aircraft emergency foam — have left a significant PFAS footprint in the surrounding environment.
EWG data (2018): MacDill's PFAS concentration in the environment was measured at 523,710 ppt — against a then-recognized "safe" limit of 70 ppt. This is among the highest military PFAS contamination readings publicly reported anywhere in the country.
Current Tampa city water: Tampa Bay Water reports it tested 29 PFAS compounds in the UCMR 5 study (2023–2025). Of 15 sampled locations, only two tested slightly above proposed federal limits for one of six regulated PFAS compounds. Tampa city water meets current federal standards.
The surrounding systems — more concerning: A October 2025 WUSF investigation into PFAS in the Tampa metro found several nearby systems with significant detections:
- USF Tampa campus system: Six chemicals detected; PFOS measured 1.4x above the new EPA limit at the consecutive connection point
- Pasco County Regional Public Water System (Land O' Lakes): PFOS averaged 1.9x the EPA limit at the Southeast WTP; six chemicals found at five locations
- Orangewood Water System (Holiday, Pinellas County): PFOS averaged 19.5x the EPA limit at Orangewood Well 1; nine chemicals found at five locations
- Tarpon Springs Water System: PFOS averaged 9.2x the EPA limit; eight chemicals found at two locations
The regulatory status: EPA issued PFAS MCLs in April 2024 (PFOA and PFOS at 4 ppt each). In May 2025, EPA extended the compliance deadline from 2029 to 2031 and signaled it may rescind MCLs for three of the six regulated PFAS (PFHxS, PFNA, and HFPO-DA). This creates regulatory uncertainty — systems currently over the limit have more time, and some standards may be weakened.
For residents concerned about PFAS in their specific zip code, checking whether you're served by Tampa Bay Water directly vs. a smaller system (like Orangewood or Tarpon Springs) is important. The WUSF data shows the contamination is highly localized.
→ Check your specific Tampa Bay ZIP code at PureCity
Disinfection Byproducts: Elevated and In Some Cases Above the MCL
Tampa Bay Water uses chloramine (not free chlorine) as its secondary disinfectant — a switch made to reduce regulated TTHMs and HAA5. This approach lowers TTHM production, but historical and third-party data shows Tampa Bay's DBP levels have been among the higher ones nationally.
Hydroviv's analysis of Tampa Bay Water data found TTHM levels up to 107 ppb in Hillsborough and Pinellas County — above the federal MCL of 80 ppb. HAA5 levels reached 47.2 ppb (approaching the 60 ppb MCL).
The organic content of the Hillsborough River and the Floridian Aquifer water both contribute to DBP precursors. Florida's warm climate also accelerates organic matter production in reservoirs and accelerates the reaction rate between chlorine compounds and organic matter.
The chloramine trade-off: While chloramine reduces TTHMs, it produces nitrosamines — particularly NDMA (N-Nitrosodimethylamine), a probable human carcinogen — and other unregulated DBPs. These aren't covered by the federal MCL but are tracked under UCMR monitoring. Standard activated carbon pitchers are not effective against chloramine; catalytic carbon or RO is required.
Naturally Occurring Radium and Uranium
Florida sits atop limestone geology with naturally elevated radium and uranium concentrations. This affects the Floridian Aquifer, which is a significant component of Tampa Bay Water's blended supply.
EWG data shows radium-226 and radium-228 detected in the Tampa Bay region above EWG's health guidelines. Both are regulated under the EPA's combined radium MCL of 5 pCi/L. Tampa Bay Water treats groundwater to remove radium before blending, but individual distribution system samples can vary.
Uranium has also been detected at trace levels. Both radium and uranium are removed by RO filtration (the desalination component of Tampa Bay Water's supply produces essentially uranium- and radium-free water, but that water is blended with treated groundwater in the final supply).
Lead: Lower Risk Than Older Cities, But Present in Pre-1986 Plumbing
Tampa Bay Water's 2020 lead sampling detected lead levels as high as 4 ppb — well below the federal action level of 15 ppb, and lower than older industrial cities. Florida's rapid post-war growth means much of the region's housing stock was built after 1986 (when lead solder was banned).
Pre-1986 homes in older Tampa neighborhoods (Ybor City, Hyde Park, Tampa Heights, Seminole Heights) and older St. Petersburg areas (Old Northeast, Historic Kenwood) may have lead solder. The risk is present but the scale is smaller than cities like Chicago, New Orleans, or Detroit.
Hardness and Salt
Tampa Bay Water's blended supply has a moderate hardness profile — lower than Phoenix or Las Vegas but noticeable. The desalination component adds some sodium to the blend (RO permeate is then remineralized, but the sodium profile is different from groundwater). If you're on a sodium-restricted diet, this is worth noting.
What Residents in Different Parts of the Region Should Do
Tampa city residents on Tampa Bay Water's main supply: PFAS is currently within the federal MCL at the main supply level, though barely at two points. Chloramine disinfection means a catalytic carbon filter (Clearly Filtered, Frizzlife SK99) or RO is recommended for taste and DBP reduction. Elevated TTHMs make a carbon-RO combination worth considering.
Residents in Orangewood (Holiday), Tarpon Springs, or other small Pinellas County systems: PFAS levels in these systems are significantly above the new EPA MCL. RO at the kitchen tap is the clear recommendation until these systems achieve compliance.
Pasco County residents (Land O' Lakes/Wesley Chapel area): PFAS at 1.9x the EPA MCL at Southeast WTP as of UCMR 5 data. RO recommended until treatment upgrades are confirmed.
Pre-1986 home residents in Tampa/St. Pete: Add NSF 53 certified lead reduction to your filter requirements.
Filter Recommendations for Tampa Bay Area
All Tampa Bay residents — minimum:
- Clearly Filtered Pitcher (~$90) — certified for PFAS, lead, chloramine, DBPs, and 360+ contaminants; best pitcher option for Tampa Bay's combined profile
Under-sink carbon block (for chloramine and DBP reduction):
- Frizzlife SK99 (~$90) — NSF 42+53; catalytic carbon block handles chloramine; strong DBP reduction; installs under kitchen sink
Under-sink RO (comprehensive — PFAS + DBPs + radium + lead):
- APEC ROES-50 (~$215) — NSF 58 certified; removes PFAS, radium, lead, DBPs, uranium, and fluoride; standard recommendation for Tampa Bay's contaminant stack
- iSpring RCC7AK (~$219) — adds alkaline remineralization; particularly useful given Tampa Bay Water's blended supply chemistry
Countertop RO for renters:
- Bluevua RO100ROPOT-LITE Countertop RO (~$299) — no installation required; NSF certified for PFAS, lead, DBPs; best option for Tampa Bay renters
Resources
- Tampa Bay Water quality reports and PFAS data: tampabaywater.org/quality
- City of Tampa UCMR 5 PFAS results: tampa.gov/water/water-quality/ucmr
- Water shortage order information: tampa.gov/WaterRestrictions
- EWG Tap Water Database: ewg.org/tapwater
Related Articles
- PFAS in Drinking Water: What It Is, Where It's Found, and How to Filter It
- Disinfection Byproducts in Drinking Water: What TTHMs and HAAs Are, Why They Form, and How to Reduce Them
- Chloramine in Drinking Water: What Standard Carbon Filters Miss
- Best Under-Sink Reverse Osmosis Systems
Sources: City of Tampa: PFAS · WUSF: Six Times the Recommended Limit of PFAS Found in USF Tampa's Drinking Water, October 24, 2025 · Tampa Bay Water: PFAS · Tampa Bay Water: EPA Study Results · Hydroviv: Problems We Found in Tampa Bay, Florida's Drinking Water · City of Tampa: UCMR · EWG Tap Water Database: Tampa