{
  "city": "McAllen",
  "state": "TX",
  "slug": "mcallen",
  "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": [
    "McAllen's water quality reports for 2019 through 2025 list no hardness figure. The 2025 report says secondary measures like this are not required to be reported.",
    "The nearest published measure we found is U.S. Geological Survey river data for the Rio Grande below Falcon Dam (1996-2000), which lists calcium and magnesium but no hardness value, so we show no figure."
  ],
  "local_details": {
    "disinfectant": {
      "text": "McAllen treats incoming river water with chlorine dioxide, then adds chlorine and ammonia to form chloramine that carries through the pipes.",
      "kind": "chloramine",
      "source_title": "McAllen Public Utility 2025 Water Quality Report",
      "source_url": "https://www.mcallenpublicutility.com/assets/docs/quality-and-education/water-quality/water-quality-report-2025.pdf",
      "evidence_ids": [
        "MCALLE-L-01"
      ]
    },
    "source_water": {
      "text": "McAllen gets Rio Grande water released from Falcon and Amistad dams, moved by irrigation districts to the utility reservoirs and treated at its South and North plants.",
      "source_title": "McAllen Public Utility 2025 Water Quality Report",
      "source_url": "https://www.mcallenpublicutility.com/assets/docs/quality-and-education/water-quality/water-quality-report-2025.pdf",
      "evidence_ids": [
        "MCALLE-L-02"
      ]
    }
  },
  "sources_checked_on": "2026-10-27",
  "site": "https://mcallenwatersystems.com/",
  "brand": "McAllen Water Systems by My Home Water System",
  "taking_requests": false
}