Laboratory Testing

The Environmental Health Unit maintains its own water bacteria testing laboratory for public and private water supplies. The laboratory is New York State and Environmental Protection Agency (EPA) approved and certified to test potable (drinking) water and non-potable (lakes, ponds, streams) water for total coliform and E.coli.

Public Water Systems

The Environmental Health Unit routinely tests and monitors all community (cities, villages, mobile home parks) and non-community (restaurants, hotels) water supplies to ensure that total coliform and E.coli levels are absent.

Private Water Systems

The Environmental Health Unit tests private water supplies (homes and businesses) when properties are being sold / transferred or when a private homeowner requests a bacteria test be performed.

Recreational and Non-Potable Water

The Environmental Health Unit routinely tests Chautauqua County permitted bathing beach water during the summer season.  Additional testing may occur in lakes, ponds and streams if conditions warrant public health safety concern.  Non-potable water is analyzed for E. coli bacteria.

Water Sample Results

Parties will be notified of their water test results by phone if the results are deemed unsatisfactory.  All results will be mailed using the contact information provided on the sample card.

What are Coliform Bacteria?

Coliform bacteria are a group of bacteria that live in the digestive tract of all warm blooded animals (birds, cats, dogs, humans, etc.) and are used as indicator bacteria. Most coliform do not usually make people ill, since the bacteria naturally live in humans. However, the presence these bacteria in water indicates that the water may have been in contact with fecal matter and the many viruses and bacteria that can cause illness.

Water Sample Fees

  • $20 per sample includes a sample bottle and test results; sample collected by an individual and brought to Mayville. Fee will be collected before an empty sample bottle is given.
  • $40 per sample; sample collected and submitted by a representative of the Environmental Health Unit.  Fee will be collected when the appointment is scheduled or may be collected at the appointment visit.

If you have questions about sample collection and drop-off please view the Procedure for Collecting Potable Samples.


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Animal Rabies Immunization Clinic

The Chautauqua County Department of Health and Huma

Food Handler Safety Certification Training


Monkeypox Vaccine Clinic

The Chautauqua County Health Department and Evergreen Health are coordinating a monkeypox vacci