Aquifer Information
A Do-It-Yourself Guide to Chlorinating Your Water Well The
Blanco-Pedernales Groundwater Conservation District receives frequent
requests for information on how to chlorinate water wells. In an attempt
to answer this question in a clear and easily understood manner, the District
is providing this guide as a courtesy and convenience to well owners.
Whether or not you chlorinate your well and how you go about are decisions
you must make. The following chlorination treatment guidelines are those
generally used by many well owners and professional well service companies.
In most cases, these procedures will successfully sterilize your well
of bacteria. The procedures are relatively simple, but can be hazardous.
If you have any doubts about your ability to safely and properly follow
these procedures, you are urged to contact a well service company for
professional help. The District is not responsible for any injuries, problems,
damages, or bacterial reoccurrences resulting from the use or misuse of
this information.
Sulfate in Blanco County Groundwater Sulfate
(SO4) occurs naturally in most of Blanco County groundwater, with higher
levels often common in the Upper Glen Rose and Middle Trinity Aquifers
found in the southern half of the county. At high levels, sulfate can
give water a bitter or astringent taste and can have mild laxative effects.
Sulfate in drinking water currently has a secondary maximum contaminant
level (SMCL) of 250 milligrams per liter (mg/L), based on aesthetic effects
(i.e., taste and odor). This regulation is provided by the Environmental
Protection Agency. It is not a Federally enforceable standard, but is
provided as a guideline for States and public water systems.
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