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Three Rivers Regional Wastewater Authority

Biosolids Programs

Class A Biosolids Program

Lime Pasteurized Product for Gardens

TRRWA produces a high quality Class A EQ (Exceptional Quality) biosolids product that must meet the strictest pathogen standards, based on federal treatment and monitoring requirements Quality standards are regulated through the Federal Clean Water Act The federal biosolids rule is contained in 40 CRF Part 503

The Three Rivers Regional Wastewater Plant is a 26 MGD (million gallons per day) facility that produces biosolids from wastewater discharged into the plant from the City of Longview, City of Kelso, Beacon Hill Water Sewer District, and Cowlitz County

Biosolids from this process are available.

Do you have any questions?
Contact Us!

(360) 577-2040

Three Rivers Regional Wastewater Authority

View our Biosolids Program Documents

Fact And Uses

Soil Conditioner

This is a unique soil conditioner & nutrient product that contains slow-release forms of nitrogen and phosphorous, as well as organic matter.  It also possesses a significant advantage to Northwest soils as it counteracts the soil acidity. It is granular in nature, damp, and can be applied using standard tillage equipment. This can be used on all agricultural crops and turf.  It can be odorous when applied, but this dissipates quickly upon application and incorporation.

PH 12.22

Directions:

  1. Use product as soon as possible to mitigate potential odor; otherwise, place a tarp over product
  2. Spread up to 1 1/2 inches on surface
  3. Thoroughly mix into soil so product is no longer visible
  4. Wash hands after

Biosolids Sample Data on a Dry Weight Basis

1Total Solids (%)
39.59
2Volatile Solids (%)
33.20
3Ammonia as Nitrogen (mg/Kg)
1,407
4Nitrate as Nitrogen (mg/Kg)
29,917
5Nitrogen, Total Organic as Nitrogen (mg/Kg)
31,344
6Total Kjeldahl Nitrogen (mg/Kg)
31,344
7Calcium Carbonate Equivalency (%)
13.22
8Arsenic (mg/Kg)
6.6
9Cadmium (mg/Kg)
0.4
10Chromium (mg/Kg)
9.8
11Copper (mg/Kg)
95.2
12Lead (mg/Kg)
8.8
13Mercury (mg/Kg)
0.05
14Molybdenum (mg/Kg)
2.33
15Nickel (mg/Kg)
3.5
16Phosphorus (mg/Kg)
8,693
17Potassium (mg/Kg)
1,684
18Selenium (mg/Kg)
2.1
19Zinc (mg/Kg)
261.5
Three Rivers Regional Wastewater Authority

Serving our Citizens

The Three Rivers Regional Wastewater Authority (TRRWA) is a municipal corporation organized pursuant to a Washington Joint Municipal Utility Services Agreement between Cowlitz County, the City of Longview, the City of Kelso, and Beacon Hill Water & Sewer District.

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