{
  "city": "Atlanta",
  "state": "GA",
  "slug": "atlanta",
  "hardness_facts": [],
  "published_span_mg_per_l": null,
  "span_converted_from_grains": false,
  "usgs_class": null,
  "usgs_class_source": "https://www.usgs.gov/water-science-school/science/hardness-water",
  "notes": [
    "None of the city's water quality reports we read (2006, 2013, 2017 through 2022 and 2025) publishes a hardness figure.",
    "The nearest published measure we found is a 1951 U.S. Geological Survey study that put Chattahoochee River water at Atlanta under 22 parts per million total hardness in 1937-38 samples. That is untreated river water from decades ago, not tap water, so we do not use it as a figure for Atlanta homes."
  ],
  "local_details": {
    "disinfectant": {
      "text": "Atlanta lists chlorine as the additive that controls microbes, with a highest monthly average of 1.13 ppm in 2025.",
      "kind": "chlorine",
      "source_title": "City of Atlanta 2025 Water Quality Report",
      "source_url": "https://drive.google.com/file/d/11kz5ciFgXn1hLVe_UzxMFVLw4z3LldlY/view?usp=share_link",
      "evidence_ids": [
        "ATLANT-L-01"
      ]
    },
    "source_water": {
      "text": "Atlanta draws all of its water from the Chattahoochee River. The Chattahoochee and Hemphill plants make about 75 percent of it, and the jointly owned Atlanta-Fulton County plant serves the northeast part of the system.",
      "source_title": "City of Atlanta 2025 Water Quality Report",
      "source_url": "https://drive.google.com/file/d/11kz5ciFgXn1hLVe_UzxMFVLw4z3LldlY/view?usp=share_link",
      "evidence_ids": [
        "ATLANT-L-02"
      ]
    }
  },
  "sources_checked_on": "2026-10-27",
  "site": "https://atlantawatersystems.com/",
  "brand": "Atlanta Water Systems by My Home Water System",
  "taking_requests": false
}