{
  "city": "San Antonio",
  "state": "TX",
  "slug": "san-antonio",
  "hardness_facts": [
    {
      "utility": "San Antonio Water System",
      "measure": "Typical hardness",
      "value_as_published": "15 to 20 grains per gallon",
      "period": "Undated FAQ page",
      "source_title": "SAWS water quality FAQs",
      "source_url": "https://www.saws.org/your-water/water-quality/saws-water-quality-concerns/faqs/"
    }
  ],
  "published_span_mg_per_l": [
    257,
    342
  ],
  "span_converted_from_grains": true,
  "usgs_class": "very hard",
  "usgs_class_source": "https://www.usgs.gov/water-science-school/science/hardness-water",
  "notes": [
    "SAWS water comes from the Edwards, Carrizo, Simsboro, Trinity and Wilcox aquifers, and some areas also get surface water from Canyon Lake.",
    "SAWS's 2026 annual report does not list hardness. It reports a free chlorine residual averaging 1.46 ppm in 2025."
  ],
  "local_details": {
    "disinfectant": {
      "text": "SAWS keeps a free chlorine residual, averaging 1.46 ppm in 2025.",
      "kind": "chlorine",
      "source_title": "SAWS 2026 Water Quality Report",
      "source_url": "https://www.saws.org/wp-content/uploads/2026/06/2026-SAWS-Water-Quality-Report.pdf",
      "evidence_ids": [
        "SANANT-L-01"
      ]
    },
    "source_water": {
      "text": "Most SAWS water is groundwater from the Edwards, Carrizo, Simsboro, Trinity and Wilcox aquifers, with Canyon Lake surface water in some areas.",
      "source_title": "SAWS 2026 Water Quality Report",
      "source_url": "https://www.saws.org/wp-content/uploads/2026/06/2026-SAWS-Water-Quality-Report.pdf",
      "evidence_ids": [
        "SANANT-L-02"
      ]
    }
  },
  "sources_checked_on": "2026-10-26",
  "site": "https://sanantoniohomewatersystems.com/",
  "brand": "San Antonio Home Water Systems by My Home Water System",
  "taking_requests": true
}