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St. PETERSBURG DRINKING WATER

St. Petersburg, Florida Drinking Water Quality Summary (as of mid-2026)

Water Source

St. Petersburg receives its drinking water through Tampa Bay Water (a regional wholesaler serving multiple counties and cities). The supply is a blend of:

  • Groundwater — From wellfields in the Floridan Aquifer.
  • Surface water — From rivers (e.g., Hillsborough River, Alafia River), reservoirs, and the Tampa Bypass Canal.
  • Desalinated seawater — From the Tampa Bay Seawater Desalination facility (Hillsborough Bay).

This diversified approach helps ensure reliability amid Florida’s variable weather and population growth.

Municipal Treatment

The City’s sole drinking water treatment facility is the Cosme Water Treatment Plant (located in Odessa, Hillsborough County, about 26 miles away). Key treatment processes include:

  • Aeration
  • Lime softening (for corrosion control)
  • Disinfection with chloramines
  • Filtration
  • pH adjustment with sodium hydroxide

The plant treats billions of gallons annually (e.g., ~10.3 billion in 2024) before distribution via transmission lines to storage and pumping facilities, then to ~300,000 customers through ~92,000 accounts.

Recent upgrades focus on aging infrastructure, SCADA systems, reliability, and resilience. The City also invests in wastewater reclamation facilities (e.g., Northwest, Northeast) for reuse and environmental protection.

Water Quality Reports and Compliance

The City publishes annual Consumer Confidence Reports (Water Quality Reports). The latest available covers 2024 data (2025 report referenced on the City site). Key highlights:

  • No Maximum Contaminant Level (MCL) violations reported.
  • Meets or exceeds all federal (EPA) and state standards.
  • Disinfectant: Chloramines (average ~3.82 ppm, within limits).
  • Disinfection byproducts (e.g., TTHM, HAA5) well below MCLs.
  • Low levels of inorganics (e.g., nitrate, barium).
  • Lead and copper: Corrosion control effective; 90th percentile results below action levels. Service line inventory available (some lead/galvanized lines historically present; City responsible for public side).

Fluoride: As of June 16, 2025, the City stopped adding fluoride due to a new Florida state law. Naturally occurring levels (typically 0.15–0.50 ppm) remain and are monitored.

PFAS and Unregulated Contaminants: Participated in EPA UCMR testing. No PFAS above reporting limits in earlier rounds; ongoing UCMR5 monitoring. Some unregulated contaminants detected at low levels, but water meets Safe Drinking Water Act standards.

Third-party analyses (e.g., TapWaterData, Hydroviv) note some contaminants (like chromium-6, arsenic) above strict health guidelines (MCLGs) but within legal MCLs. Filters are recommended by some for extra caution.

Infrastructure Projects

  • Cosme WTP improvements — SCADA, yard piping, operational upgrades for efficiency and resilience.
  • Regional projects via Tampa Bay Water, including a $181 million expansion of the Surface Water Treatment Plant (capacity +12.5 MGD, expected online 2028).
  • Wastewater/reclamation upgrades (e.g., Northwest WRF improvements for sustainability and wet-weather management).

Ongoing focus on pipe replacement, storage, and storm resilience.

Pipe Breaks and Distribution Issues

  • Occasional water main breaks, especially during storms (e.g., Hurricane Milton in 2024 caused breaks and temporary outages/boil water notices).
  • Aging infrastructure leads to occasional low pressure, discolored water (sediment/iron), or service interruptions. The City responds with repairs and public alerts.
  • Residents report occasional brown water (often hot water tank sediment) or pressure issues.

Customer Complaints

Common issues include:

  • Discolored water (iron/sediment, often from home plumbing or main breaks).
  • Taste/odor (chloramines).
  • Low pressure after breaks or maintenance.
  • The City maintains 24/7 dispatch for leaks/quality issues (727-893-7261). Overall, water is described positively in community feedback as reliable and meeting standards.

Private Wells

St. Petersburg is primarily served by the municipal system, but private wells exist (especially in less urbanized or older areas).

  • Florida DOH recommends annual testing for coliform bacteria, nitrates, and lead (every 3 years) for private well owners.
  • Wells tap the Floridan Aquifer; depth varies widely. Local testing services are available. Municipal water is the dominant source for most residents.

Overall Assessment: St. Petersburg’s drinking water is considered safe and high-quality by regulatory standards, with strong treatment and monitoring. Challenges include aging pipes, storm vulnerabilities, and trace contaminants of emerging concern (addressed through ongoing upgrades and testing). For the most current data, check the City’s latest Water Quality Report or contact Water Resources at 727-893-7261. Home filters can provide additional peace of mind for sensitive individuals.

Sources include official City of St. Pete reports, Tampa Bay Water, and EPA-related data.

Tampa Bay Seawater Desalination Plant Overview

The Tampa Bay Seawater Desalination Plant (also called Tampa Bay Desal) is a key component of the regional water supply for the Tampa Bay area, including St. Petersburg. It is one of the largest seawater desalination facilities in the United States and serves as a drought-proof alternative water source.

History and Development

  • Opened: Fully operational in 2007 (initial production earlier; faced early challenges with membrane fouling and design issues requiring remediation).
  • Project Evolution: Started as a Design-Build-Own-Operate-Transfer (DBOOT) project in the late 1990s/early 2000s. Transitioned through models due to construction and performance issues. Total capital cost reached ~$158 million (including ~$48 million in remediation).
  • Operator: Public-private partnership. Tampa Bay Water owns the facility; operated/maintained by partners like American Water-Acciona.
  • Purpose: Reduce over-reliance on groundwater (which caused environmental issues like wetland damage) and provide reliable supply amid population growth and droughts.

Capacity and Operations

  • Design Capacity: Up to 25 million gallons per day (MGD) of drinking water (peak ~28–29 MGD). Can produce ~10% of the region’s drinking water needs for over 2.5 million people.
  • Process:
  1. Intake: Draws seawater (up to ~50 MGD) from Tampa Bay via shared infrastructure with the Tampa Electric (TECO) Big Bend Power Plant’s cooling water system.
  2. Pretreatment: Rigorous filtration to remove particulates.
  3. Reverse Osmosis (RO): High-pressure membranes separate freshwater from salt and impurities.
  4. Post-treatment: Remineralization, disinfection (typically blended with other supplies), and quality adjustments.
  5. Brine Discharge: Concentrated saltwater (brine) is diluted (70:1 ratio) with power plant cooling water before discharge back into Tampa Bay.
  • Production History: Has produced tens of billions of gallons since 2007. Operates variably based on demand and cost (often below full capacity due to higher operating expenses compared to other sources).
  • Energy Use: Reverse osmosis is energy-intensive; costs fluctuate with power prices.

Role in Regional Water Supply

Tampa Bay Water blends desalinated water with groundwater, surface water, and other sources for members like St. Petersburg, Tampa, and counties. It enhances resilience against droughts and growth. Expansion plans (e.g., additional capacity) have been discussed to meet future demand through the 2030s.

Environmental Impact and Monitoring

  • Marine Life and Bay Health: Extensive pre- and post-construction studies (including by independent experts) concluded minimal impact. Brine dilution prevents significant salinity increases. Comprehensive hydrobiological monitoring (thousands of samples, continuous salinity tracking) since 2003 shows no measurable long-term changes to Tampa Bay’s water quality or ecology.
  • Sustainability: Shares infrastructure with the power plant, reducing new construction footprint. Supports reduced groundwater pumping, aiding aquifer and wetland recovery.
  • Challenges: Initial concerns about brine sinking or affecting oxygen/nutrients were addressed through design. Ongoing monitoring continues.

Costs and Economics

  • Capital: ~$158 million total.
  • Operating Costs: Higher than traditional sources (variable costs can make unit cost $2–$4+ per 1,000 gallons depending on production volume). Not always run at full capacity for economic reasons.
  • Value: Drought-proof reliability justifies inclusion in the portfolio. Blended rates keep overall water affordable.

Recent Developments (2025–2026)

  • Ongoing RO improvements and reliability upgrades to maintain design capacity.
  • Part of broader Tampa Bay Water investments in sustainable supply (e.g., surface water expansions).
  • Public tours and education efforts highlight its role in water education.

Summary: The Tampa Bay Desalination Plant is a pioneering, successful large-scale seawater RO facility in the U.S. It provides critical, reliable drinking water while demonstrating strong environmental safeguards. Though more expensive to operate than other sources, its drought resistance makes it invaluable for long-term resilience in Florida’s growing region. For the absolute latest data, visit Tampa Bay Water’s official page.