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Solids Analysis

Solids are categorized into several groups based on particle size and characterization. Most wastewaters are analyzed for one or several of the following types.

Total Suspended Solids (TSS)
Total Dissolved Solids (TDS)
Volatile Suspended Solids (VSS)
Total Solids (TS)

Analysis of solids in domestic wastewaters allow system operators to determine treatment efficiency as well as determining compliance with various regulatory agencies.

Total Suspended Solids

TSS are the amount of filterable solids in a water sample. Samples are filtered through a glass fiber filter. The filters are dried and weighed to determine the amount of total suspended solids in mg/l of sample.

Total Dissolved Solids

TDS are those solids that pass through a filter with a pore size of 2.0 micron. or smaller. They are said to be non-filterable. After filtration the filtrate (liquid) is dried and the remaining residue is weighed and calculated as mg/l of Total Dissolved Solids.

Volatile Suspended Solids

Volatile solids are those solids lost on ignition (heating to 550 degrees C.) They are useful to the treatment plant operator because they give a rough approximation of the amount of organic matter present in the solid fraction of wastewater, activated sludge and industrial wastes.

Total Solids

TS are the total of all solids in a water sample. They include the total suspended solids, total dissolved solids, and volatile suspended solids.

Sample Submission

Due to workload and facility requirements all wastewater samples must have prior approval. All samples must be submitted in approved containers and delivered to the laboratory at 7102 W Okanogan Pl Kennewick, WA. Inquires about sample analysis not listed are welcomed and will be accommodated whenever possible.

For more information and/or assistance, contact the Environmental Health Division at 460 4205 or the BFHD Laboratory at 460 4206.
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Benton Franklin Health District
7102 W Okanogan Pl
Kennewick WA
(509) 460 4200
412 W Clark
Pasco WA
(509) 547-9737

Emergency Contact Information

Personal Emergency for Medical, Police, Fire, or Other: 911
Washington Poison Center: 1 (800) 222-1222 (www.wapc.org)
Washington Community Resource Information: 211 (www.win211.org)
BFHD Public Health Emergency/Imminent Health Hazard After-Hours Reporting: 509-543-3851
The public can reference BFHD policies available in Kennewick office.
BFHD Privacy Statement:English / Spanish
Copies of the annual report available at all BFHD offices.
State and County Resources
Rules and Regulations Administered by or Governing the Benton-Franklin Health District
WAC's - RCW's
Community Health Status Indicators
Reportable Conditions
Contact: info(at)bfhd.wa.gov                                                                                                                             Employees