A Ramona or Fallbrook well can pass the eye test and still come back total-coliform positive. That result is an indicator. It is not a name for every germ in the casing. Clear Water Pros SD connects well owners with licensed water-treatment and well professionals. The brand does not shock, chlorinate, or sample wells itself.
What a coliform result actually means
CDC’s well-testing guidance, dated July 1, 2024, says to test at least once a year for total coliforms, nitrates, total dissolved solids, and pH. Use a state-certified laboratory. EPA rules that protect public systems do not apply to privately owned wells.
Coliform bacteria live in people’s and animals’ guts, in soil, on plants, and in surface water. CDC says they generally will not make you sick. They typically enter water the same way disease-causing germs do, and they are easier to test for. A high total-coliform count means harmful germs are also likely in the water.
You can also test for fecal coliforms or E. coli. A positive on those tests likely means feces entered the well. An E. coli indicator test does not show whether a dangerous type of E. coli is present. That needs a more specific method.
This is CDC mechanism language. It is not a San Diego County well-occurrence rate. Do not borrow an occurrence rate or result from another well.
Do this before anyone doses the well
If the lab or the County says the water is unsafe, CDC says to drink bottled water or another safe source. Contact San Diego County Department of Environmental Health and Quality, or the State Water Board, for what to do next.
CDC’s treating-well-water page, dated July 2, 2024, is blunt. Do not drink the well until it is treated. Contact the health department or a well-water contractor. No single home treatment type protects against every problem. If germs are the issue and you have no other safe source, boiling kills germs. Boiling does not remove chemicals. After treatment, test again before you resume use.
Do not pour bleach down a 92065 casing because a neighbor did. MDH shock-chlorination language on our iron-bacteria page is Minnesota well-disinfection guidance, not a homeowner recipe for this lot.
Well water testing in San Diego County covers the annual panel. Pair coliform with nitrate. CDC lists animal waste, septic systems, wastewater, flooded sewers, stormwater, fertilizers, farm runoff, and decaying plants as possible nitrate sources. Local geology matters too. That list is possible sources, never the cause of your well.
Clues that are not a coliform test
Orange slime, a swampy odor, or a rainbow sheen can be iron bacteria. Rotten-egg odor can be hydrogen sulfide in the well, the plumbing, or the heater. City of San Diego tap color is a different path: rusty municipal water. None of those replace a certified coliform bottle.
Test again after flooding, well repair, a change in taste, color, or smell, a pregnancy, or a child moving in. CDC names those extra triggers. A handheld strip is a screen. It is not a coliform result.
Frequently asked questions
Does a positive total-coliform result mean I have E. coli?
No. Total coliform is the broader indicator. Fecal coliform or E. coli is a separate test. Ask the lab which method they ran.
Can a sediment filter clear coliform?
A sediment filter on well water catches particles. CDC says match treatment to the identified problem. A cartridge does not stand in for disinfection of the well.
Is the City of San Diego water-quality report enough?
No. That report is for the City public system. A private well needs its own certified lab work.
Call a licensed well or treatment pro
Bring the lab sheet, the well log if you have one, and any County letter. A separately licensed professional decides the method. Call (858) 400-4647 and Clear Water Pros SD will connect you with an independent local water-treatment professional.