{
  "city": "Tampa",
  "state": "FL",
  "slug": "tampa",
  "hardness_facts": [
    {
      "utility": "Tampa Water Department",
      "measure": "Total hardness",
      "value_as_published": "Average 185 mg/L (10.8 grains per gallon)",
      "period": "Calendar year 2024",
      "source_title": "2024 Water Quality Report (City of Tampa, published 2025)",
      "source_url": "https://www.tampa.gov/sites/default/files/document/2025/2024-water-quality-report-ada-compliant.pdf"
    },
    {
      "utility": "Tampa Water Department",
      "measure": "Hardness through the year",
      "value_as_published": "About 140-300 ppm (8-17 grains per gallon)",
      "period": "Undated document",
      "source_title": "Understanding Water Hardness (City of Tampa)",
      "source_url": "https://www.tampa.gov/sites/default/files/document/2026/understanding-water-hardness.pdf"
    }
  ],
  "published_span_mg_per_l": [
    140,
    300
  ],
  "span_converted_from_grains": false,
  "usgs_class": "hard to very hard",
  "usgs_class_source": "https://www.usgs.gov/water-science-school/science/hardness-water",
  "notes": [
    "The Tampa Water Department adds monochloramine (chlorine and ammonia) before water leaves the plant.",
    "The city says hardness changes with the seasons. It also uses stored aquifer water and buys water from Tampa Bay Water when needed."
  ],
  "local_details": {
    "disinfectant": {
      "text": "Tampa adds ammonia to make chloramine so the water stays disinfected through the pipes.",
      "kind": "chloramine",
      "source_title": "Tampa 2024 Water Quality Report",
      "source_url": "https://www.tampa.gov/sites/default/files/document/2025/2024-water-quality-report-ada-compliant.pdf",
      "evidence_ids": [
        "TAMPA-L-01"
      ]
    },
    "source_water": {
      "text": "Tampa relies mainly on the Hillsborough River, plus treated water stored in aquifer wells and a small share bought from Tampa Bay Water (2.5 percent in 2024).",
      "source_title": "Tampa 2024 Water Quality Report",
      "source_url": "https://www.tampa.gov/sites/default/files/document/2025/2024-water-quality-report-ada-compliant.pdf",
      "evidence_ids": [
        "TAMPA-L-02"
      ]
    },
    "seasonal": {
      "text": "The city says hardness is lower in the wet season and higher in the dry season.",
      "source_title": "City of Tampa, Understanding Water Hardness",
      "source_url": "https://www.tampa.gov/sites/default/files/document/2026/understanding-water-hardness.pdf",
      "evidence_ids": [
        "TAMPA-L-03"
      ]
    }
  },
  "sources_checked_on": "2026-10-27",
  "filtration": null,
  "site": "https://tampabaywatersystems.com/",
  "brand": "Tampa Bay Water Systems by My Home Water System",
  "taking_requests": true
}