Callahan, City Of - Callahan WWTF
618399 Dr Martin Luther King Jr Ave, Callahan, FL 32011 · Nassau County · Publicly Owned Treatment Works
- Average flow
- 0.15 MGD
- Design flow
- 0.5 MGD
- NPDES permit
- FL0038407
- Effective
- Permit expires
- May 2028
- Population served
- 1,646
- CWNS 2022
Callahan, City Of - Callahan WWTF is a publicly owned wastewater treatment works in Callahan, Nassau County, Florida treating an average of 0.15 million gallons per day against a permitted design capacity of 0.5 MGD, serving about 1,646 residents. It discharges under NPDES permit FL0038407 (effective), which expires in May 2028, with 21 recorded violations in the last three years.
Treatment technology
10 treatment structures and unit processes identified at Callahan, City Of - Callahan WWTF.
Available with a free Klarifi account
See the full treatment train at Callahan, City Of - Callahan WWTF: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 21
- Effluent violations
- 21
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for Callahan, City Of - Callahan WWTF, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Callahan, City Of - Callahan WWTF, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Florida
Callahan · 4 mi away
0.0099 MGD
Jacksonville · 7 mi away
0.02 MGD
Hilliard · 10 mi away
0.26 MGD
Yulee · 17 mi away
1.71 MGD
Jacksonville · 19 mi away
21.38 MGD
Jacksonville · 21 mi away
0.18 MGD
Fernandina Beach · 22 mi away
0.95 MGD
Jacksonville · 24 mi away
11.38 MGD
Callahan, City Of - Callahan WWTF: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed October 26, 2026; facility record last updated October 22, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Equalization tank · Centrate · all terms