County of Marin Health and Human Services

Public Health Laboratory Services

The Public Health Laboratory offers bacterial testing for well-water safety and tick identification for Lyme disease upon request.


  • Well Water Testing is $24.00
  • Tick Identification is $34.00

Please make checks out to: Public Health Laboratory.
We cannot accept cash or credit cards.

*Fees are subject to change without prior notice.

Well Water Testing Procedure:

  • Pick up a kit at the Marin HHS Connection Center - 3240 Kerner Blvd, San Rafael, CA 94901
  • The kit contains:
    • A container for your water specimen
    • A form to be submitted with the sample
  • After collecting the sample return the kit to the Marin HHS Connection Center.

Water Testing Resources:

Tick Removal Procedure:

  • If possible, have someone else remove the tick from you.
  • Use tweezers or forceps rather than your fingers.
  • If you must touch tick use a tissue or gloves to protect your hand.
  • Grasp the tick's mouthparts as close to the skin as possible.
  • Gently pull the tick straight out, steadily and firmly. Do not twist or jerk the tick.
  • If mouthparts of the tick break off and remain in your skin, consult your physician.

Tick Collection Procedure:

  • Place tick into clean capped container or a zip-lock plastic bag. Place a piece of cotton or tissue moistened with tap water into the container with the tick. (Note: do not use alcohol, formalin or other liquids. Do not stick tick to scotch tape. These materials make testing for the Lyme organism unsatisfactory.)
  • Bring or ship tick to the laboratory as soon as possible.
  • Complete a laboratory supply the following information:
    • Name, address and birth date of person bitten.
    • Location of the bite (arm, neck, etc.)
    • Date tick removed.
    • Estimated duration of time tick was attached (i.e. 4hrs, 24hrs, etc.)
    • Geographical location (what city, park, etc.) tick was obtained.
    • Phone number, name and address of person to receive report.
    • Any obvious symptoms.

Tick Resources:

The Napa/Solano/Yolo/Marin Public Health Laboratory (NSYMPHL) offers an extensive array of clinical and biological tests related to communicable diseases. For information about specific tests, please call the laboratory at (707) 784-4410.