South Casa Beach S.D.: Children's Pool
Tested by San Diego County, usually every 7 days.
Taken 16 days ago. Results can take 1 to 3 weeks to be published, and many sites are tested less often in winter.
Every bacteria in this test: Total coliform 3,200 · Fecal coliform 1,600 · Enterococcus 220. The grade follows the worst one against its own limit.
Grade C over 6 tests from Sep 30, 2026 to Oct 28, 2026. 1 was over the limit.
Stay out until a retest passes
The latest test was over the safe limit. No one can say how long that lasts: the beach is cleared when a new test comes back under the limit. This site is usually tested every 7 days, so a newer test may already be taken and not yet published.
County status: Advisory, checked Friday, Nov 13 (San Diego County Department of Environmental Health and Quality). The county’s posting is the final word.
Cause not known
No significant rain fell in the 3 days before this test, and the testing agency does not name a cause.
Enterococcus over time
- Wednesday, Oct 28, 2026Total coliform 3,200 · Fecal coliform 1,600 · Enterococcus 220
- Tuesday, Oct 20, 2026Fecal coliform 120 · Total coliform 100 · Enterococcus 42
- Monday, Oct 19, 2026Fecal coliform 160 · Total coliform 280 · Enterococcus 6
- Wednesday, Oct 7, 2026Fecal coliform 400 · Total coliform 800 · Enterococcus 18
- Tuesday, Oct 6, 2026Fecal coliform 260 · Total coliform 80 · Enterococcus under 2
- Wednesday, Sep 30, 2026Fecal coliform 60 · Total coliform under 200 · Enterococcus 16
- Monday, Sep 21, 2026Fecal coliform 120 · Total coliform 200 · Enterococcus 16
- Tuesday, Sep 15, 2026Fecal coliform 18 · Total coliform under 20 · Enterococcus 4
- Wednesday, Sep 9, 2026Fecal coliform 560 · Total coliform 680 · Enterococcus 30
- Wednesday, Sep 2, 2026Fecal coliform 840 · Total coliform 1,400 · Enterococcus 240
Enterococcus and coliform bacteria live in the guts of people and animals. Health departments test for them because they travel with sewage, runoff and animal waste, so a high count is a warning that germs that do make people sick are likely in the water too. Clear water can still be contaminated: bacteria and viruses are too small to see.
San Diego County's DNA test (ddPCR) counts bacterial DNA instead of growing the bacteria in a lab, so it returns results the same day. Its numbers run higher than the older lab tests, which is why its safe limit is 1,413 rather than 104. The two are never compared on this page.
San Diego County's health department says swimming in water under an advisory can cause stomach illness, such as diarrhea and vomiting, and skin and ear infections. The EPA's national swimming guidelines are set at a level where about 32 to 36 of every 1,000 swimmers would get a stomach illness. A study of San Diego surfers found about 12 extra stomach-illness cases per 1,000 in wet weather, highest during rain and the day after, and back near normal 3 days later.
The grade is Nautical Nick's, built on the official limits: A is a quarter of the limit or less, B half or less, C under the limit, D over it, and F more than 10 times over. When a county posts an advisory or closes a beach, its sign is the final word.
Sources: California State Water Board beach test results; San Diego County Department of Environmental Health sample reports; Surfrider Foundation Blue Water Task Force; National Weather Service daily rain totals via the Iowa Environmental Mesonet (Carlsbad Palomar Airport CA, San Diego/Montgomery Fld, San Diego/Lindberg). Limits: California Code of Regulations, Title 17, Section 7958.