Warren County

• Warren County reports no lead, no galvanized-requiring-replacement, and no unknown-material service lines anywhere in its distribution system.
• The system is a patchwork of five sub-systems: Franklin-Clearcreek and Richard Renneker on county wells, Socialville on Cincinnati water, and Pennyroyal and Sharts Road on Springboro water.
• A November 2024 lab mix-up - nitrite tested instead of nitrate - drew an Ohio EPA monitoring violation even though the retest came back below the nitrate limit.
• The 24 county wells pump more than 2 billion gallons a year, and the finished water averages 140 mg/L of hardness, about 8 grains.

• 1960sThe Warren County Water & Sewer Department began operating and says it has never permitted lead pipe in its mains or on customer service laterals.
• 2022Softening started up at both plants after a corrosion control study done with Ohio EPA, and nanofiltration membrane treatment was added.
• January 2023Nanofiltration membrane construction was completed, cutting hardness and improving removal of PFAS, pesticides and herbicides.
• July 2024Ohio EPA approved merging the Franklin-Clearcreek and Richard Renneker systems into the new Warren County Public Water System.
• April 2025The county began building ion exchange PFAS treatment at the Renneker plant, scheduled to finish that November.

How it is treated

24 wells in 5 wellfields feed two county plants: Franklin Area (7 wells) and Renneker (4 wellfields). Softening, nanofiltration membranes, pH control with sodium hydroxide and orthophosphate, then fluoride and chlorine; Renneker adds ion exchange for PFAS.

Water pressure

not published - no psi figure found; the county uses elevated storage such as the 20 Mile elevated tower rather than publishing a system average.

$5.70 per 1,000 gallons

2026 water: $34.20 bimonthly minimum covers 0-6,000 gal, then $5.70 per 1,000 gal, plus a $5.00 bimonthly repair/replacement charge. Sewer billed separately.

EPA compliance record

Lead at the tap: 90th-percentile result 1.3 ppb in 2026 (action level 15 ppb).

EPA record: no health-based violations since 2015.

2 violations of any kind logged since 2020, 2 of them paperwork (monitoring, reporting, public notice or consumer report).

Recent and current work

• Nanofiltration membrane treatment at both plants · 2023 · completed
  Added in 2022 and completed January 2023 at Renneker and Franklin Area; cuts hardness and removes PFAS, pesticides and herbicides.
• Renneker Water Treatment Plant ion exchange PFAS system · 2025 · completed
  Anion exchange added to the existing nanofiltration building; AECOM engineer, Shook Construction builder. No public cost figure found.
• Franklin-Clearcreek / Richard Renneker system merger · 2024 · completed
  Ohio EPA approved consolidation into a single Warren County Public Water System in July 2024.

Planned or needed

• Future capital program
  No Warren County capital improvement plan or Ohio EPA loan-list entry for future water projects was found in the sources reviewed.

Ohio EPA classes the Great and Little Miami buried valley aquifers highly susceptible, given contaminant sources in the protection areas. Low PFAS at the Renneker wellfields drove nanofiltration then ion exchange. 15% of customers drink Springboro water, whose aquifer sits under 5 ft of cover.

Sanitary

The Warren County Water & Sewer Department also runs county sanitary sewer. 2026 sewer rates are a $34.32 bimonthly minimum for 0-6,000 gal then $5.72 per 1,000 gal, with a separate Carlisle-area sewer-only rate. Plant names, capacities and any consent decree were not found.

Storm

Not detailed in sources reviewed.

Compiled from the utility's own reports and public records, then independently re-checked against primary sources.