{
  "city": "Las Vegas",
  "state": "NV",
  "slug": "las-vegas",
  "hardness_facts": [
    {
      "utility": "Las Vegas Valley Water District",
      "measure": "Hardness",
      "value_as_published": "280 parts per million (16 grains per gallon)",
      "period": "Calendar year 2025",
      "source_title": "LVVWD 2026 Water Quality Report",
      "source_url": "https://www.lvvwd.com/assets/pdf/water-quality-report-las-vegas-valley-current.pdf"
    }
  ],
  "published_span_mg_per_l": [
    280,
    280
  ],
  "span_converted_from_grains": false,
  "usgs_class": "very hard",
  "usgs_class_source": "https://www.usgs.gov/water-science-school/science/hardness-water",
  "notes": [
    "About 90 percent of the water comes from Lake Mead on the Colorado River and about 10 percent from deep groundwater wells.",
    "The district disinfects with chlorine. Its 2025 free chlorine residual averaged 0.99 ppm.",
    "One section of the district's water quality FAQ page gives 291 ppm (17 grains per gallon). The current annual report gives 280 ppm."
  ],
  "local_details": {
    "disinfectant": {
      "text": "Chlorine is added as water leaves the treatment plants to protect it on the way to the tap.",
      "kind": "chlorine",
      "source_title": "Las Vegas Valley Water District 2026 Water Quality Report",
      "source_url": "https://www.lvvwd.com/assets/pdf/water-quality-report-las-vegas-valley-current.pdf",
      "evidence_ids": [
        "LASVEG-L-01"
      ]
    },
    "source_water": {
      "text": "About 90 percent of Las Vegas Valley water comes from Lake Mead, and about 10 percent from wells in a deep valley aquifer.",
      "source_title": "Las Vegas Valley Water District 2026 Water Quality Report",
      "source_url": "https://www.lvvwd.com/assets/pdf/water-quality-report-las-vegas-valley-current.pdf",
      "evidence_ids": [
        "LASVEG-L-02"
      ]
    },
    "seasonal": {
      "text": "Groundwater is used mainly from April through October to meet peak demand, so some areas get a blend of well water and Lake Mead water then.",
      "source_title": "Las Vegas Valley Water District 2026 Water Quality Report",
      "source_url": "https://www.lvvwd.com/assets/pdf/water-quality-report-las-vegas-valley-current.pdf",
      "evidence_ids": [
        "LASVEG-L-03"
      ]
    }
  },
  "sources_checked_on": "2026-10-26",
  "site": "https://vegaswatersystems.com/",
  "brand": "Vegas Water Systems by My Home Water System",
  "taking_requests": true
}