{ "type": "water", "pwsid": "OH2100311", "name": "Delaware City", "county": "Delaware", "population": 43895, "producer": true, "source_class": "river", "label": "Olentangy River (blended with deep wells)", "bodies": [ "Olentangy River" ], "intakes": [ "Olentangy" ], "wells": 5, "aquifer": "local deep wells (>200 ft) blended with river water", "notes": "Two intakes (North/South) draw from the Olentangy River; plant can blend river water with groundwater from on-site deep wells (5 active wells) during low-flow periods.", "urls": [ "https://www.delawareohio.net/government/departments/public-utilities/our-utilities", "https://1808delaware.com/delaware/delaware-releases-annual-water-quality-report-a-comprehensive-overview/", "https://delcowater.org/del-cos-water-sources/" ], "chain": [ "OH2100311" ], "plants": [ { "n": "City of Delaware Water Treatment Plant", "a": "3080 US Highway 23 N, Delaware, OH 43015 (address per City of Delaware; exact site not independently mapped)", "la": 40.315, "lo": -83.063, "pt": "approximate", "wb": "Olentangy River", "src": "Olentangy River, drawn via the city's North and South intakes upstream of town (blended with 5 active deep wells)", "cls": "river", "in": [ { "n": "Olentangy North Intake", "wb": "Olentangy River", "role": "primary", "src": "Upstream (northern) river intake on the Olentangy feeding the city plant north of downtown Delaware", "la": 40.322, "lo": -83.065, "pt": "approximate" }, { "n": "Olentangy South Intake", "wb": "Olentangy River", "role": "primary", "src": "Second, more southerly Olentangy River intake for the same plant; no published lead/backup ranking", "la": 40.308, "lo": -83.067, "pt": "approximate" }, { "n": "Delaware municipal well field", "wb": "Groundwater (deep wells, 200+ ft)", "role": "secondary", "src": "Five active deep city wells whose water is routinely blended with Olentangy River water at the plant", "la": 40.315, "lo": -83.063, "pt": "approximate" }, { "n": "Water Plant Wells", "wb": "Not named by the city or Ohio EPA; at more than 200 ft the wells are far below Delaware County's thin glacial sand-and-gravel lenses (5-25…", "role": "secondary", "src": "Wells on the treatment plant grounds, drilled over 200 ft deep; their water is filtered for iron and manganese before blending (>200 ft)", "la": 40.315, "lo": -83.063, "pt": "plant" }, { "n": "Penry Road Well Field", "wb": "Not named by the city or Ohio EPA; same more-than-200-ft bedrock setting as the plant wells - below the county's thin glacial sand and…", "role": "secondary", "src": "A second well field on Penry Road about two miles north of the plant, also drawing water from more than 200 ft down (>200 ft)", "la": 40.364, "lo": -83.08, "pt": "approximate" } ] } ], "facts": { "hist": [ [ "1808", "Town of Delaware platted; the modern water system comes well over a century later." ], [ "2024", "City completes its federally required lead service line inventory in November and begins notifying affected customers." ], [ "2025", "Ohio EPA records a Tier 3 monitoring-and-reporting violation for the January 2025 lead service line notification period." ], [ "2026", "That violation is resolved in January; the city states it was a notification requirement, not a drinking water quality problem." ] ], "treat": "River water gets aluminum chlorohydrate coagulation, settling, then ultra- and nanofiltration membranes; well water gets iron/manganese pressure filters plus its own NF membranes. The two streams merge, then chlorine, fluoride and a corrosion inhibitor.", "press": "Not published; no psi figure or pressure-zone map found. The city cites 190 miles of water line and 2,000 fire hydrants in its distribution system.", "rate": { "g": null, "n": "No per-1,000-gallon schedule is published online. Bills combine water, wastewater, stormwater and curbside refuse; delinquent bills draw a 5% penalty.", "m": null }, "imp": [ [ "TTHM (total trihalomethanes)", "19.4", "ppb", "80", "2025", "Range 7-30.4 ppb; comfortably under the limit for a surface-water source." ], [ "HAA5 (haloacetic acids)", "9.33", "ppb", "60", "2025", "Range ND-12.1 ppb." ], [ "Lead (90th percentile)", "ND", "ppb", "15 (action…", "2024", "Range ND-3.1 ppb; 0 of 32 sites above the action level." ], [ "Copper (90th percentile)", "0.099", "ppm", "1.3 (action…", "2024", "Range 0.011-0.110 ppm; 0 of 32 sites above the action level." ], [ "Nitrate", "0.41", "ppm", "10", "2025", "Range ND-1.26 ppm; low for a farmed watershed." ], [ "Atrazine", "0.2", "ppb", "3", "2025", "Herbicide runoff from row crops; range ND-0.7 ppb, detected every year." ], [ "Fluoride", "0.98", "ppm", "2.0 (secondary…", "2025", "Range 0.84-1.23 ppm; added to prevent tooth decay." ], [ "Hardness (as CaCO3)", "118", "ppm", "no standard", "2024", "Range 77-162 ppm - hard water, as the limestone bedrock would suggest." ] ], "proj": [ [ "Lead service line inventory and customer notification", null, "2024-2026", "completed", "Nov 2024 inventory and required notices; a Tier 3 monitoring/reporting violation for Jan 2025 was resolved in Jan 2026." ] ], "plan": [], "stress": "The Olentangy is a developed farm-and-suburb watershed and Ohio EPA rates the city's supply as highly susceptible to contamination; atrazine turns up every year. Deep wells under the plant and a Penry Road wellfield give a groundwater fallback most river-fed Ohio systems lack.", "sew": { "s": "The city's own sewer division collects and treats wastewater and returns it to the Olentangy River, over 175 miles of sewer line, 3,250 manholes and 12 pump stations. Plant name, capacity and any CSOs or consent decree were not confirmed.", "st": "Separate storm sewers, billed as a stormwater charge on the utility bill. The city maintains a stormwater management plan and an illicit discharge detection and elimination plan under federal MS4 rules." }, "fun": [ "Delaware pushes its river water through two membrane stages, ultrafiltration then nanofiltration, a far more aggressive filtration train than most Ohio river systems run.", "Well water is treated on a completely separate line - iron and manganese pressure filters, then its own nanofiltration - before the two finished streams meet in one clearwell.", "Backup wells sit both under the plant and in a wellfield on Penry Road two miles north, so a bad day on the Olentangy need not be a bad day at the tap.", "Del-Co Water Company, the big regional nonprofit serving the countryside around Delaware, is a separate utility on entirely different sources - easy to confuse with the city plant." ] }, "zips_served": [ { "zip": "43015", "share": 0.5491, "dominant": true } ], "photo": { "url": "/photos/OH2100311.jpg", "caption": "Delaware Dam and Reservoir on the Olentangy River, upstream of Delaware, Ohio", "credit": "Sixflashphoto", "license": "CC BY-SA 4.0" }, "url": "https://crackedbuckeye.com/water/OH2100311/", "api": "https://crackedbuckeye.com/api/water/OH2100311.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), \"Delaware City · OH2100311\", https://crackedbuckeye.com/water/OH2100311/, built 2026-09-16, accessed [date].", "schema": "https://crackedbuckeye.com/api/schema.json" }