What is the address of Grassy Branch WWTP?

The address on the plant’s EPA facility record is Old Fish Rd, Monroe, NC 28111, in Union County. Its coordinates are 35.1300, -80.4964. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Grassy Branch WWTP treat?

Grassy Branch WWTP is permitted for a design flow of 0.05 MGD. Its average daily flow is not available in the current EPA data.

What treatment technology does Grassy Branch WWTP use?

Klarifi has identified one treatment structure or unit process at the Monroe facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Grassy Branch WWTP?

The facility discharges under NPDES permit NC0085812, currently administratively continued, expiring October 2023.

Is Grassy Branch WWTP in compliance?

Discharge monitoring reports show 23 violations at Grassy Branch WWTP in the last three years, 23 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Grassy Branch WWTP and how do I contact them?

Grassy Branch WWTP is a publicly owned treatment works in Monroe, North Carolina. Klarifi lists 2 verified decision-maker contacts for this facility, available with a free trial.

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Grassy Branch WWTP

Old Fish Rd, Monroe, NC 28111 · Union County · Publicly Owned Treatment Works

Average flow: —

Design flow: 0.05 MGD

NPDES permit: NC0085812; Administratively continued

Permit expires: October 2023

Population served: 1,600; CWNS 2022

Grassy Branch WWTP is a publicly owned wastewater treatment works in Monroe, Union County, North Carolina, serving about 1,600 residents. It discharges under NPDES permit NC0085812 (administratively continued), which expires in October 2023, with 23 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Grassy Branch WWTP.

Available with a free Klarifi account

See the full treatment train at Grassy Branch WWTP: structures, unit processes and planned upgrades, with exact unit counts.

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Compliance snapshot (last 3 years)

Total violations: 23

Effluent violations: 23

Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.

Key contacts

2 verified contacts for Grassy Branch WWTP, with validated emails and direct phone numbers.

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Names, validated emails and direct phone numbers for decision-makers at Grassy Branch WWTP, plus the full compliance history and discharge data.

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Nearby wastewater treatment plants in North Carolina

Yadkin River Water Treatment Plant

Unionville · 5 mi away

0.63 MGD

West Stanly WWTP

Oakboro · 15 mi away

0.64 MGD

Twelve Mile Creek WWTP

Waxhaw · 19 mi away

—

Norwood WWTP

Norwood · 22 mi away

—

Irwin Creek Wastewater Treatment Plant

Charlotte · 24 mi away

10.55 MGD

Badin WWTP

Badin · 28 mi away

—

Town Of Mooresville

Mooresville · 32 mi away

—

Anson County Regional WWTP

Wadesboro · 32 mi away

—

Grassy Branch WWTP: 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 September 2, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Activated sludge · Oxidation ditch · all terms

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