Water system
Mid-ohio WSD - Chrisman Avenue WTP
EPA ID OH4900712 · Madison County · 10,256 people served · owned by a local government
Mid-ohio WSD - Chrisman Avenue WTP treats its own water from Local glacial sand-and-gravel wells (Madison County).
The system's record
- Active wells
- 6
- Serves
- 10,256 people · Madison County
- EPA ID
- OH4900712
Could not confirm a named aquifer specifically for the Chrisman Avenue WTP wellfield; Madison County groundwater is generally thin glacial till sand/gravel lenses, with more productive outwash aquifers near Big/Little Darby Creek to the north/east, so kept SDWIS 'own groundwater' hypothesis with…
About this area's water
Did you know
- London softens its water with lime — the 2025 CCR runs a photo of the plant's lime softening contact tanks.
- Cyanide is on London's list of detected contaminants, at 7 ppb against a 200 ppb limit — about a 29th of the MCL.
- Arsenic in London's water runs at 5 ppb, exactly half the federal limit, in a state where most groundwater systems report a fraction of that.
- The district's proposed new regional water plant is budgeted at $60-90 million for construction-management services alone, before design, land or permits.
- Board meetings for a London water system are held in Plain City, at the village's municipal building on the first and third Tuesday of each month.
History6
- 2023-2024The City of London's water and sewer systems transferred to the Mid-Ohio Water and Sewer District, which has issued London City PWS consumer confidence reports since the 2023 report. Trustees have…
- 2022-07London City PWS had an E. coli MCL violation; a public notice was issued at the time, but the district failed to include it in the 2022 CCR as required — one of four CCR content deficiencies (2017…
- 2023-07London failed to collect well water samples for E. coli after a routine total coliform positive in the distribution system; a public notice was issued. One Level 1 assessment and three corrective…
- 2024-01The Village of Plain City formally transferred control of its water and sewer services, including billing, to Mid-Ohio WSD.
- 2025-07-01London City PWS missed the federal deadline for annual Service Line Materials Notifications, sending inadequate and incorrect notices — a reporting violation under 40 CFR 141.85 and 141.90.
- 2025-09-18Mid-Ohio corrected the Service Line Inventory and distributed proper notifications to the right residents, resolving the violation.
Treatment & pressure
How it is treated
Groundwater from a wellfield in a shallow glacial sand-and-gravel (buried valley) aquifer, treated by lime softening — the 2025 CCR carries a photograph captioned 'London's lime softening contact tanks' — followed by chlorination (total chlorine 1.08 mg/L in 2025) and fluoridation (0.96 ppm).…
Source: midohiowsd.gov
Water pressure
Not published — no psi figure appears in the London City CCR, the district's fee schedule, its capital projects page, or the board minutes reviewed.
Source: midohiowsd.govmidohiowsd.gov
What it costs
$9.96 per 1,000 gallons
Typical household bill about $48 a month for water.
From the Mid-Ohio WSD 'Water and Sanitary Sewer Fee Schedule - 2024,' the current schedule linked from the district's Fee Schedule page (which notes only that tap fees changed in…
Water quality & impurities10
| Contaminant | Level | Limit | Year |
|---|---|---|---|
| Arsenic Range 2.0-5.0 ppb — half the MCL, and notably higher than most Ohio groundwater systems. MCLG is zero. | 5 ppb | 10 | 2025 |
| Total Trihalomethanes (TTHM) Range 0.7-39.9 ppb. | 24.8 ppb | 80 | 2025 |
| Haloacetic Acids (HAA5) Range 0.0-9.3 ppb. | 5.3 ppb | 60 | 2025 |
| Total chlorine Range 0.6-1.6 mg/L. | 1.08 mg/L | 4 (MRDL) | 2025 |
| Fluoride Range 0.94-1.10 ppm; includes added fluoride. | 0.96 ppm | 4 | 2024 |
| Cyanide Range 7.0-7.0 ppb; CCR attributes it to discharge from plastic, fertilizer and steel/metal factories. | 7 ppb | 200 | 2024 |
| Barium Range 0.0059-0.0059 ppm. | 0.0059 ppm | 2 | 2024 |
| Chromium Range 0.9-0.9 ppb. | 0.9 ppb | 100 | 2024 |
| Lead (90th percentile) Zero of 20 samples exceeded the action level. The printed unit and value are internally inconsistent in the CCR table… | 0.002 ppm (the… | 15 ppb (action… | 2025 |
| Copper (90th percentile) Zero of 20 samples exceeded the action level. The CCR's copper row is garbled in the published PDF (the 90th-percentile… | 0.086 ppm | 1.3 (action… | 2025 |
Source: midohiowsd.gov
EPA compliance record
Lead at the tap: 90th-percentile result 2.1 ppb in 2025 (action level 15 ppb).
EPA health-based violations since 2015:
- 2022Revised Total Coliform Rule · exceeded a maximum contaminant level · returned to compliance
7 violations of any kind logged since 2020, 6 of them paperwork (monitoring, reporting, public notice or consumer report).
Projects & plans10
Recent and current work
- New regional water treatment plant (5 MGD, CMAR delivery) · 2026 · proposed
RFQ issued 2026-05-03; CMAR to be contracted by June 30, 2026. Nominal capacity 5 MGD, technology still in alternatives analysis (lime softening or membranes… - Plain City water plant renovation and additional well · 2026 · planned
District capital plan (updated June 3, 2025): renovation operational by September 2026, new well operational February 2026. Serves the Plain City PWS, not…
Source: midohiowsd.govmidohiowsd.govmidohiowsd.gov
Planned or needed
- SR 161 water transmission line and water tower · 2026 · planned
Transmission line May 2026-May 2027; tower April 2026-April 2027. Cost not published. - Water District water treatment plant expansion · 2027 · planned
Operational November 2027. Serves the district's Water District 1 system. Cost not published. - Northeastern new water treatment facility · 2027 · planned
Construction January 2027-January 2029. Cost not published. - Central new water treatment facility · 2027 · planned
Construction July 2027-July 2029. Cost not published. - Regional Water Reclamation Facility · 2028 · planned
Sewer project; target online and operational June 2028. Cost not published. - London Gateway sanitary sewer, Phase 1 · 2026 · planned
Construction April-October 2026, on the London side of the system. Cost not published. - US 42 force main sewer to the regional WRF · 2026 · planned
Construction August 2026-February 2028. Cost not published. - US 40 sanitary sewer (SR 56 to US 42) · 2026 · planned
Construction August 2026-February 2028. Cost not published.
Source: midohiowsd.govmidohiowsd.gov
Supply stress
The documented risk is aquifer vulnerability, not shortage. Ohio EPA's source water study rates the aquifer supplying London as HIGHLY SUSCEPTIBLE to contamination, on three grounds: a relatively thin protective clay layer over the uppermost sand and gravel aquifer, a shallow aquifer depth of less than 75 feet below ground surface, and…
Sewers
Sanitary
Mid-Ohio WSD provides sanitary sewer as well as water across its Madison County service area, and operates the London wastewater treatment plant (used as a board meeting location). Sewer is metered off the drinking water meter reading. London Service Area residential sewer: $13.48 monthly minimum plus $5.82 per 1,000 gallons. Outside the…
Storm
Not documented — no stormwater utility, fee, or program appears in the district's fee schedule, capital projects page, or board minutes reviewed. The district's predecessor entity in Madison County was the Madison County Sanitary and Stormwater District, but…
Sourcesverified
Compiled from the utility's own reports and public records, then independently re-checked against primary sources.
Main supplier in 1 ZIP code
Serves
Main water supplier in 1 ZIP code
- 43140 · London50% of residents
Population-weighted resident shares; a ZIP code can have more than one system on record. Recomputed from each ZIP's own system list, not from the map's cached footprint.
Buys from · Sells to
Mid-ohio WSD - Chrisman Avenue WTP does not buy water from another system on record; it treats its own source water.
No other system is on record buying water from Mid-ohio WSD - Chrisman Avenue WTP.
Photograph
On the map
Show this system's territory on the map — 1 ZIP code in all.
Sources
U.S. EPA SDWIS and Community Water System Service Area Boundaries (v3, 2026), Ohio EPA primacy data, 2020 census blocks: the system serving most residents, traced through purchases to the treating utility; Ohio EPA 2023 Sewer and Water Rate Survey (Ohio State, May 2025) for household bills; Ohio EPA DEFA loan awards since 2016 for the loans paragraph · EPA SDWIS · EPA service area boundaries · Ohio EPA drinking water · Ohio EPA rate survey
Mid-ohio WSD - Chrisman Avenue WTP's own pages: dam.assets.ohio.gov, midohiowsd.gov
Notable facts: midohiowsd.gov, midohiowsd.gov, midohiowsd.gov
History: midohiowsd.gov, midohiowsd.gov, plaincityohio.gov, midohiowsd.gov
Water quality: midohiowsd.gov
Planned work: midohiowsd.gov, midohiowsd.gov
Water pressure: midohiowsd.gov, midohiowsd.gov
Capital projects: midohiowsd.gov, midohiowsd.gov, midohiowsd.gov
Rates: midohiowsd.gov, midohiowsd.gov, midohiowsd.gov
Sewers: midohiowsd.gov, midohiowsd.gov, midohiowsd.gov
Treatment: midohiowsd.gov
Supply stress: midohiowsd.gov, midohiowsd.gov, midohiowsd.gov