Monmouth STP

The address on the plant’s EPA facility record is 401 N Hogan Rd, Monmouth, OR 97361, in Polk County. Its coordinates are 44.8567, -123.2191. For some plants the record holds the utility’s mailing address rather than the plant gate.

Monmouth STP treats an average of 1.56 MGD and is permitted for a design flow of 0.6 MGD.

EPA's enforcement records list 1 formal civil enforcement case naming Monmouth STP, 0 since fiscal year 2020. The latest case reached its current status in August 2004 (administrative order, final order with penalty). Penalties assessed across the cases total $750. The full case history, with milestones, violation types and EPA's case summaries, is shown in Klarifi with a free account.

Klarifi has identified 2 treatment structures and unit processes at the Monmouth facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

The facility discharges under NPDES permit OR0020613, currently effective, expiring December 2030.

Discharge monitoring reports show 3 violations at Monmouth STP in the last three years, 3 of them effluent limit exceedances. The full history is available in Klarifi.

Monmouth STP is a publicly owned treatment works in Monmouth, Oregon. Klarifi lists decision-maker contacts for this facility, available with a free trial.