{
  "city": "Nashville",
  "state": "TN",
  "slug": "nashville",
  "hardness_facts": [
    {
      "utility": "Metro Water Services",
      "measure": "Total hardness",
      "value_as_published": "100.5 mg/L, range 88.5-128.4 mg/L",
      "period": "2023 data, in the 2025 report",
      "source_title": "2025 Consumer Confidence Report",
      "source_url": "https://www.nashville.gov/sites/default/files/2026-05/2025_Consumer_Confidence_Report-FINAL.pdf?ct=1777986674"
    },
    {
      "utility": "Metro Water Services",
      "measure": "Calcium hardness",
      "value_as_published": "75.3 mg/L, range 63.9-92.6 mg/L",
      "period": "Undated row, 2025 water quality report",
      "source_title": "2025 Water Quality Report (Nashville Metro Water Service PWSID TN0000494)",
      "source_url": "https://www.nashville.gov/sites/default/files/2026-04/Water_Quality_Report-2025.pdf?ct=1777578711"
    }
  ],
  "published_span_mg_per_l": [
    88.5,
    128.4
  ],
  "span_converted_from_grains": false,
  "usgs_class": "moderately hard to hard",
  "usgs_class_source": "https://www.usgs.gov/water-science-school/science/hardness-water",
  "notes": [
    "Metro Water Services calls Nashville's water moderately hard. Calcium hardness is only part of total hardness."
  ],
  "local_details": {
    "disinfectant": {
      "text": "Metro Water Services disinfects with a small amount of bleach, a form of chlorine, averaging 1.60 ppm in its 2025 report.",
      "kind": "chlorine",
      "source_title": "Metro Water Services 2025 Consumer Confidence Report",
      "source_url": "https://www.nashville.gov/sites/default/files/2026-05/2025_Consumer_Confidence_Report-FINAL.pdf?ct=1777986674",
      "evidence_ids": [
        "NASHVI-L-01"
      ]
    },
    "source_water": {
      "text": "Metro Water draws from the Cumberland River and treats it at the K.R. Harrington and Omohundro plants.",
      "source_title": "Metro Water and Sewerage Services Annual Disclosure FY2025",
      "source_url": "https://www.nashville.gov/sites/default/files/2026-05/Metro_Water_and_Sewerage_Services_Annual_Disclosure_FY2025.pdf?ct=1778591132",
      "evidence_ids": [
        "NASHVI-L-02"
      ]
    },
    "service": {
      "text": "Metro Water serves most of Davidson County, but several separate utility districts, such as Harpeth Valley Utility District, also operate inside the county, so check your bill.",
      "source_title": "Metro Water and Sewerage Services Annual Disclosure FY2025",
      "source_url": "https://www.nashville.gov/sites/default/files/2026-05/Metro_Water_and_Sewerage_Services_Annual_Disclosure_FY2025.pdf?ct=1778591132",
      "evidence_ids": [
        "NASHVI-L-03"
      ]
    }
  },
  "sources_checked_on": "2026-10-27",
  "site": "https://nashvillewatersystems.com/",
  "brand": "Nashville Water Systems by My Home Water System",
  "taking_requests": false
}