{ "type": "water", "pwsid": "OH7002914", "name": "Mansfield City", "county": "Richland", "population": 51000, "producer": true, "source_class": "reservoir", "label": "Clear Fork Reservoir (Clear Fork of the Mohican River), plus 9 city wells", "bodies": [ "Clear Fork Reservoir", "Clear Fork Mohican River" ], "intakes": [ "Clear Fork River" ], "wells": 9, "aquifer": "", "notes": "Surface water from Clear Fork Reservoir is blended with water from 9 wells (4 under influence of surface water) before treatment.", "urls": [ "https://ci.mansfield.oh.us/public-works-departments/water-treatment/", "https://en.wikipedia.org/wiki/Clear_Fork_Reservoir" ], "chain": [ "OH7002914" ], "plants": [ { "n": "Mansfield Water Treatment Plant", "a": "2010 Lexington Springmill Road South, Mansfield, OH 44904", "la": 40.7045, "lo": -82.5829, "pt": "plant", "wb": "Clear Fork Reservoir (Clear Fork of the Mohican River)", "src": "Clear Fork Reservoir, a 4.5-billion-gallon impoundment of the Clear Fork southwest of the treatment plant, supplemented by 9 city groundwater wells", "cls": "reservoir", "in": [ { "n": "Clearfork Reservoir intake (gatehouse)", "wb": "Clearfork Reservoir (Clear Fork of the Mohican River)", "role": "primary", "src": "Gatehouse at the Clearfork Reservoir dam southwest of the plant; operators can draw from four different depths in this 4.5-billion-gallon lake, and a lowlift pump station sends up to 25 million gallons a day to the plant", "la": 40.6967, "lo": -82.6068, "pt": "dam" }, { "n": "North well field (4 wells, GUI)", "wb": "Groundwater under the direct influence of surface water", "role": "secondary", "src": "Four wells north of the plant, designated by Ohio EPA as under the influence of surface water; blended with reservoir water every day rather than held in reserve", "la": 40.72, "lo": -82.583, "pt": "approximate" }, { "n": "South well field (5 wells)", "wb": "Groundwater (not under the influence of surface water)", "role": "secondary", "src": "Five wells south of the plant, not designated as under surface-water influence; with the north wells they can supply up to 10 million gallons a day into the daily blend", "la": 40.69, "lo": -82.583, "pt": "approximate" }, { "n": "North Well Field", "wb": "Shallow glacial sand-and-gravel (valley outwash) - Ohio EPA's source water assessment puts the aquifer less than 30 ft below ground under a…", "role": "primary", "src": "Four wells north of the plant in shallow valley sand and gravel, so tied to the stream that Ohio EPA treats them as surface water (4 wells · aquifer less than 30 ft below ground…)", "la": 40.7045, "lo": -82.5829, "pt": "plant" }, { "n": "South Well Field", "wb": "Bedrock aquifer beneath a moderately thick clay layer - Ohio EPA's assessment treats Mansfield's 'bedrock wellfields' separately from its…", "role": "primary", "src": "Five wells south of the plant drawing bedrock water from under a clay cap, blended with the north wells and reservoir water (5 wells · not published)", "la": 40.7045, "lo": -82.5829, "pt": "plant" } ] } ], "facts": { "hist": [ [ "1949", "Clear Fork Reservoir built, impounding the Clear Fork of the Mohican River to serve Mansfield as its surface water source." ], [ "1960", "Present wastewater treatment plant went into service as a 4 MGD facility; capacity was expanded between 1984 and 1987." ], [ "2023-2024", "Voters rejected a quarter-percent water-main income tax in Nov. 2023 (5,865-5,251), then approved it in March 2024 by 97 votes (2,701-2,604)." ], [ "2025", "City launched a $3.6 million water main program and recorded three treatment technique violations at the water plant, including a nine-hour turbidity violation on Jan. 2." ], [ "2026", "Stantec sediment survey found roughly 5.5 million cubic yards of silt and ~26% capacity loss, but concluded the reservoir remains dependable for at least 50 more years." ] ], "treat": "Blend of surface and ground water - about 22% from the 4.4-billion-gallon Clear Fork Reservoir (24-inch line) and about 78% from municipal wells (two 18-inch lines), with the ratio set by lake clarity, algal blooms and taste/odor. Potassium permanganate at the intake controls zebra mussels; then…", "press": "not published; no system-wide psi figure appears in the city's plant pages or the 2025 CCR", "rate": { "g": null, "n": "No per-1,000-gallon figure is published online. Utility Collections directs residents to city ordinances 937.11 (water) and 941.08 (sewer) for yearly rates and fees; the ordinance…", "m": null }, "imp": [ [ "Total trihalomethanes (TTHM)", "75.0", "ppb", "MCL 80", "2025", "Running average at 94% of the MCL; single samples ranged to 108.6 ppb" ], [ "Haloacetic acids (HAA5)", "52.5", "ppb", "MCL 60", "2025", "Range 18.2-78.5; TTHM and HAA5 exceeded operational evaluation levels at 4 of 8 sites in Q3" ], [ "Turbidity", "2.60", "NTU", "TT: 1.0 NTU max", "2025", "Exceeded the limit - treatment technique violation; 98.3% of samples met the standard" ], [ "Lead (90th percentile)", "1.8", "ppb", "AL 15", "2025", "90th percentile well under the action level, but 1 of 31 samples exceeded 15 ppb" ], [ "Copper (90th percentile)", "0.2", "ppm", "AL 1.3", "2025", "0 of 31 samples over the action level" ], [ "Nitrate", "0.58", "ppm", "MCL 10", "2025", "Range 0.13-0.58; low for an agricultural watershed" ], [ "Combined radium", "2.35", "pCi/L", "MCL 5", "2022", "From the well sources; gross alpha was 3.02 pCi/L against a 15 limit" ], [ "PFOA", "0.00102", "ppb", "MCL 0.004", "2025", "About 1 ppt, a quarter of the new federal limit; PFOS 0.000921 ppb, other four PFAS non-detect" ] ], "proj": [ [ "Water main replacement program (4-inch to 8-inch mains)", 3600000, "2025", "under construction", "About 14,000 feet of main, 37 hydrants and 246 reconnected homes in six areas; first phase of a 53-mile replacement need." ], [ "Clear Fork Reservoir sediment survey", 149799, "2026", "completed", "Stantec study found ~5.5 million cubic yards of sediment and ~26% capacity loss, yet a dependable supply for 50+ years." ] ], "plan": [ [ "Continued small-diameter water main replacement (53 miles total)", null, "2025-2029", "planned", "About three miles per year over roughly four funding cycles, paid from the 0.25% income tax generating ~$4.8 million annually." ] ], "stress": "Silt has claimed roughly 26% of Clear Fork Reservoir's capacity since 1949 and it has never been dredged, though a 2026 Stantec survey found 50+ years of dependable supply. Nearer-term pressures are on the treatment side: three treatment technique violations in 2025 and disinfection byproducts running close to their limits.", "sew": { "s": "City-operated wastewater treatment plant (not a regional district): 12 MGD average design flow, 25 MGD peak. Treatment runs equalization, bar screening, aerated grit removal, primary clarification, extended aeration in eight tanks, four final clarifiers, then chlorination and dechlorination, with anaerobic digestion and centrifuge…", "st": "Largely separate storm system - about 400 miles of storm lines, 7,200-plus catch basins and roughly 1,200 outfalls draining to 10 major waterways. No stormwater utility fee is published." }, "fun": [ "Despite the reservoir's prominence, only about 22% of Mansfield's tap water is lake water - roughly 78% comes from municipal wells, and the blend shifts with algae blooms and taste-and-odor episodes.", "Potassium permanganate is dosed right at the reservoir intake for one specific job: keeping zebra mussels from colonizing the intake line.", "About 5.5 million cubic yards of silt have settled into Clear Fork Reservoir since 1949 - roughly a quarter of its capacity - and it has never once been dredged.", "Mansfield voters rejected a quarter-percent water-main income tax in November 2023, then passed the very same tax four months later by 97 votes." ] }, "zips_served": [ { "zip": "44901", "share": 1.0, "dominant": true }, { "zip": "44902", "share": 0.9984, "dominant": true }, { "zip": "44907", "share": 0.8609, "dominant": true }, { "zip": "44906", "share": 0.4606, "dominant": true }, { "zip": "44903", "share": 0.3741, "dominant": true }, { "zip": "44905", "share": 0.0965, "dominant": true }, { "zip": "44904", "share": 0.2176, "dominant": false } ], "photo": { "url": "/photos/OH7002914.jpg", "caption": "Clear Fork Reservoir, source of Mansfield, Ohio's water supply", "credit": "JBTHEMILKER", "license": "CC BY-SA 4.0" }, "url": "https://crackedbuckeye.com/water/OH7002914/", "api": "https://crackedbuckeye.com/api/water/OH7002914.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), \"Mansfield City · OH7002914\", https://crackedbuckeye.com/water/OH7002914/, built 2026-09-16, accessed [date].", "schema": "https://crackedbuckeye.com/api/schema.json" }