{
  "city": "Gilbert",
  "state": "AZ",
  "slug": "gilbert",
  "hardness_facts": [
    {
      "utility": "Town of Gilbert",
      "measure": "Total hardness",
      "value_as_published": "Average 10.79 grains per gallon (184.44 mg/L), range 6.61-17.54 grains per gallon",
      "period": "Calendar year 2025",
      "source_title": "Gilbert 2025 Annual Drinking Water Quality Report",
      "source_url": "https://www.gilbertaz.gov/home/showpublisheddocument/54483/639183476630708025"
    }
  ],
  "published_span_mg_per_l": [
    113,
    300
  ],
  "span_converted_from_grains": true,
  "usgs_class": "moderately hard to very hard",
  "usgs_class_source": "https://www.usgs.gov/water-science-school/science/hardness-water",
  "notes": [
    "Gilbert disinfects with chlorine. Its 2025 residual averaged 0.92 ppm."
  ],
  "local_details": {
    "disinfectant": {
      "text": "Gilbert disinfects plant water with ozone and chlorine, and its pipes carry chlorine.",
      "kind": "chlorine",
      "source_title": "Gilbert water quality page",
      "source_url": "https://www.gilbertaz.gov/departments/public-works/water/water-quality-91",
      "evidence_ids": [
        "GILBER-L-01"
      ]
    },
    "source_water": {
      "text": "Gilbert gets Salt and Verde River water through Salt River Project canals and Colorado River water through the Central Arizona Project, plus groundwater from 17 wells.",
      "source_title": "Gilbert water quality page",
      "source_url": "https://www.gilbertaz.gov/departments/public-works/water/water-quality-91",
      "evidence_ids": [
        "GILBER-L-02"
      ]
    },
    "seasonal": {
      "text": "Gilbert leans on groundwater during high demand and when canals are dried out for maintenance.",
      "source_title": "Gilbert water quality page",
      "source_url": "https://www.gilbertaz.gov/departments/public-works/water/water-quality-91",
      "evidence_ids": [
        "GILBER-L-03"
      ]
    }
  },
  "sources_checked_on": "2026-10-26",
  "site": "https://gilbertwatersystems.com/",
  "brand": "Gilbert Water Systems by My Home Water System",
  "taking_requests": true
}