{
  "type": "water",
  "pwsid": "OH0903912",
  "name": "Southwest Regional Water District",
  "county": "Butler",
  "population": 42856,
  "producer": true,
  "source_class": "groundwater",
  "label": "Great Miami Buried Valley Aquifer (wells)",
  "bodies": [],
  "intakes": [],
  "wells": 7,
  "aquifer": "Great Miami Buried Valley Aquifer",
  "notes": "Production wells (two treatment plants, incl. W. Guy Metcalf WTP) pump from the Great Miami Buried Valley/River Valley Aquifer in western Butler County; also a Groundwater Consortium participant.",
  "urls": [
    "https://data.epa.gov/efservice/WATER_SYSTEM_FACILITY/PWSID/OH0903912/JSON",
    "https://www.hamilton-oh.gov/utility-operations",
    "https://gwconsortium.org/the-great-miami-buried-valley-aquifer/"
  ],
  "chain": [
    "OH0903912"
  ],
  "plants": [
    {
      "n": "W. Guy Metcalf Water Treatment Plant",
      "a": "Ross Township, Butler County, OH (no street address is publicly published; district administrative office is 3640 Old…",
      "la": 39.345,
      "lo": -84.643,
      "pt": "approximate",
      "wb": "Great Miami Buried Valley Aquifer",
      "src": "Three district wells (~1,600 gpm each) in the Great Miami buried valley, Ross Twp, southwest Butler County",
      "cls": "groundwater",
      "in": [
        {
          "n": "Guy Metcalf Well Field (Ross Township)",
          "wb": "Great Miami Buried Valley Aquifer (sand and gravel)",
          "role": "primary",
          "src": "Three wells pumping 1,600 gpm each from the Great Miami valley gravels in Ross Twp; the district's original plant, rated 3.6 MGD. (3 wells)",
          "la": 39.345,
          "lo": -84.643,
          "pt": "approximate",
          "sh": 37,
          "wells": [
            "Well 1",
            "Well 2",
            "Well 3"
          ]
        }
      ]
    },
    {
      "n": "North Water Treatment Plant",
      "a": "St. Clair Township, Butler County, OH (no street address is publicly published; district administrative office is 3640…",
      "la": 39.455,
      "lo": -84.555,
      "pt": "approximate",
      "wb": "Great Miami Buried Valley Aquifer",
      "src": "Four wells on a 100-acre district wellfield over the Great Miami valley aquifer, St. Clair Twp, north of Hamilton",
      "cls": "groundwater",
      "in": [
        {
          "n": "North Plant Well Field (St. Clair Township)",
          "wb": "Great Miami Buried Valley Aquifer (sand and gravel)",
          "role": "primary",
          "src": "Four wells on a 100-acre district site in the Great Miami valley gravels north of Hamilton; plant rated 6 MGD, expandable to 8. (4 wells)",
          "la": 39.455,
          "lo": -84.555,
          "pt": "approximate",
          "sh": 63,
          "wells": [
            "Well 1",
            "Well 2",
            "Well 3",
            "Well 4"
          ]
        }
      ]
    }
  ],
  "facts": {
    "hist": [
      [
        "1968",
        "Organized as the Southwestern Butler County Water Association, a not-for-profit rural water cooperative: a 2.3 mgd plant, 160 miles of main, about 2,800 users."
      ],
      [
        "1978-1981",
        "Added 150 miles of main and 1,100 users, expanded treatment capacity to 3.6 mgd, and renamed itself The Water Association."
      ],
      [
        "1992",
        "Completed a $3,000,000 improvement (4 elevated tanks, a clearwell, 15 miles of transmission main) and reorganized as the Southwest Regional Water District, effective Sept 1, 1992."
      ],
      [
        "1997",
        "The North Water Treatment Plant began operating in May 1997, ending the W. Guy Metcalf plant's run as the district's only production facility."
      ],
      [
        "2003",
        "Ohio EPA found the Great Miami Buried Valley Aquifer very productive but highly susceptible to contamination."
      ]
    ],
    "treat": "Two plants treat Great Miami Buried Valley Aquifer groundwater: W. Guy Metcalf (Ross Twp, 3.6 MGD, three 1,600-gpm wells) does chlorination, fluoridation and softening; North WTP (St. Clair Twp, 6 MGD, four wells) adds iron and manganese removal.",
    "press": "Not published; the district operates 18 storage tanks across its pressure zones but states no psi figure.",
    "rate": {
      "g": 7.05,
      "n": "$7.05 per 1,000 gallons effective Feb 1, 2026, plus a $20.00/month minimum service availability charge, raised from $19.00.",
      "m": null
    },
    "imp": [
      [
        "Nitrate",
        "1.26-2.23",
        "ppm",
        "10",
        "2025",
        "North plant 1.26, Metcalf 2.23. CCR calls it evidence of manmade influence."
      ],
      [
        "Total trihalomethanes (TTHM)",
        "11.6-17.3",
        "ppb",
        "80",
        "2025",
        "17.3 at DS201, 11.6 at DS202; well under the MCL."
      ],
      [
        "Haloacetic acids (HAA5)",
        "4.8",
        "ppb",
        "60",
        "2025",
        "4.8 at DS201, non-detect at DS202."
      ],
      [
        "Lead (90th percentile)",
        "1.3",
        "ppb",
        "15",
        "2025",
        "0 of 30 samples exceeded the 15 ppb action level."
      ],
      [
        "Copper (90th percentile)",
        "0.566",
        "ppm",
        "1.3",
        "2025",
        "0 of 30 samples exceeded the 1.3 ppm action level."
      ],
      [
        "Fluoride",
        "1.18-1.21",
        "ppm",
        "4",
        "2025",
        "North 1.18, Metcalf 1.21; added by the district."
      ],
      [
        "Combined radium",
        "1.15",
        "pCi/L",
        "5",
        "2023",
        "Naturally occurring; well under the MCL."
      ],
      [
        "PFBS (PFAS)",
        "0.00309",
        "ppb",
        "n/a",
        "2023",
        "UCMR5: detected at Metcalf, non-detect at North plant. No MCL for PFBS."
      ]
    ],
    "proj": [
      [
        "SR 122 Water Main Replacement (West Alexandria Rd to Hill St)",
        null,
        "",
        "under construction",
        "Listed in progress on the district's capital projects page; no cost published."
      ],
      [
        "Darrtown Rd Water Main Replacement (Stillwell Beckett Rd to Shollenbarger Rd)",
        null,
        "",
        "under construction",
        "Listed in progress on the district's capital projects page; no cost published."
      ],
      [
        "SR 503 Water Main Replacement (Tolbert Rd to Oxford Middletown Rd)",
        null,
        "",
        "completed",
        "Listed complete on the district's capital projects page."
      ],
      [
        "W. Guy Metcalf WTP Well #1 and Well #2 rehabilitation",
        null,
        "",
        "completed",
        "Both well rehabilitations listed complete; the plant runs three production wells."
      ],
      [
        "Water System Master Plan",
        null,
        "",
        "completed",
        "Listed complete on the district's capital projects page."
      ]
    ],
    "plan": [
      [
        "SR 177 Water Main Replacement (North St to Somerville Rd)",
        null,
        "",
        "planned",
        "Listed as planned on the district's capital projects page."
      ],
      [
        "Taylor Rd Water Main Replacement (Ringwood Rd to Jones Rd)",
        null,
        "",
        "planned",
        "Listed as planned on the district's capital projects page."
      ],
      [
        "US 27 Water Main Replacement south of Minton Rd",
        null,
        "",
        "planned",
        "About 1,600 feet of water main to be replaced."
      ],
      [
        "North Plant Rehabilitation",
        null,
        "",
        "planned",
        "Listed as planned on the district's capital projects page; no cost published."
      ]
    ],
    "stress": "Ohio EPA determined in 2003 that the Great Miami Buried Valley Aquifer, though very productive, is highly susceptible to contamination. The district's CCR says nitrate in treated water (1.26-2.23 ppm) confirms manmade influence, well under the 10 ppm standard. No drought or capacity limits reported.",
    "sew": {
      "s": "The district sells water only. Its own Sewer Service Rates page carries no rates and instead points customers to Butler County Water & Sewer Department and the City of Hamilton. Rural unincorporated parts of the service area rely on on-site septic systems.",
      "st": "Not detailed in district sources; the service area is largely rural and low-density."
    },
    "fun": [
      "It began in 1968 as a farmer-organized rural water cooperative and only became a political subdivision in 1992, which let it borrow tax-free.",
      "Its aquifer-protection consortium is an odd coalition: Butler County Water & Sewer, the cities of Hamilton, Fairfield and Cincinnati, and the Molson-Coors brewery.",
      "The average district household uses about 155 gallons of water a day.",
      "In all of 2025 the district drew just 69,090 gallons through its emergency connection with the City of Hamilton, across five days."
    ]
  },
  "zips_served": [
    {
      "zip": "45062",
      "share": 1.0,
      "dominant": true
    },
    {
      "zip": "45070",
      "share": 1.0,
      "dominant": true
    },
    {
      "zip": "45064",
      "share": 0.9335,
      "dominant": true
    },
    {
      "zip": "45053",
      "share": 0.7867,
      "dominant": true
    },
    {
      "zip": "45055",
      "share": 0.5526,
      "dominant": true
    },
    {
      "zip": "45013",
      "share": 0.3698,
      "dominant": false
    },
    {
      "zip": "45042",
      "share": 0.2915,
      "dominant": false
    },
    {
      "zip": "45003",
      "share": 0.2812,
      "dominant": false
    },
    {
      "zip": "45056",
      "share": 0.1799,
      "dominant": false
    },
    {
      "zip": "45311",
      "share": 0.1503,
      "dominant": false
    },
    {
      "zip": "45067",
      "share": 0.072,
      "dominant": false
    },
    {
      "zip": "45030",
      "share": 0.0527,
      "dominant": false
    },
    {
      "zip": "45014",
      "share": 0.0402,
      "dominant": false
    },
    {
      "zip": "45011",
      "share": 0.0307,
      "dominant": false
    },
    {
      "zip": "45327",
      "share": 0.0268,
      "dominant": false
    },
    {
      "zip": "45005",
      "share": 0.0037,
      "dominant": false
    }
  ],
  "photo": {
    "url": "/photos/OH0903912.jpg",
    "caption": "Friends Meetinghouse in West Elkton, Ohio, one of the district's served communities",
    "credit": "Nyttend",
    "license": "Public domain"
  },
  "url": "https://crackedbuckeye.com/water/OH0903912/",
  "api": "https://crackedbuckeye.com/api/water/OH0903912.json",
  "generated": "2026-09-16",
  "license": "CC BY 4.0 for the compilation; each source keeps its own terms",
  "cite": "Cracked Buckeye (Open Shower Co), \"Southwest Regional Water District · OH0903912\", https://crackedbuckeye.com/water/OH0903912/, built 2026-09-16, accessed [date].",
  "schema": "https://crackedbuckeye.com/api/schema.json"
}