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TDS is that portion of solids in water that can pass through a 2 micron filter. The more minerals dissolved into the water the higher the total dissolved solids.

Waters with high dissolved solids are generally of inferior palatability. In drinking water a limit of 500 mg/L is desirable.

Total Hardness

Originally hardness was understood to be a measure of the capacity of water to precipitate soap. Soap is precipitated chiefly by the calcium and magnesium ions present.

In conformity with current practice, total hardness is defined as the sum of the calcium and magnesium concentrations, both expressed as calcium carbonate, in milligrams per liter.

Often it is desirable to know hardness of source waters prior to treatment, or to determine if treatment is desired, and finished water after treatment (water softener) to determine treatment efficiency.

Sample Submission

If TDS or Hardness is desired contact the laboratory directly for container size and availability.

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