E. Coli & Coliform Enumeration Test

Overview

This test counts E. coli and total coliform bacteria in colony-forming units per 100 mL using Standard Method 9223B. E. coli is the indicator organism public health agencies use nationwide to judge recreational water safety, because it lives in the intestines of warm-blooded animals and its presence means fecal material has reached the water. Total coliform is the broader group, useful for detecting general contamination and decaying organic matter. This is the test behind beach advisories and closures.

What problem does this solve for our lake?

Nobody can look at a lake and tell whether it is safe to swim in. Bacterial contamination is invisible, it spikes and clears within days, and the sources are usually things nobody wants to think about: a failing septic system, a stormwater outfall after heavy rain, a large gull or goose population, agricultural runoff, or a boat discharging waste. E. coli itself rarely makes people sick at the levels found in lakes. It matters because it travels with the organisms that do — the bacteria, viruses, and protozoa in fecal material that cause gastrointestinal illness, skin infections, and ear and eye infections. Counting E. coli is how you detect the presence of that whole category without testing for each pathogen individually. For orientation, the U.S. EPA recommended criterion for recreational freshwater is a geometric mean of 126 CFU per 100 mL, with a single-sample threshold commonly set around 235 CFU per 100 mL. Your state or county may set different numbers, and the applicable standard is theirs, not ours. Two things make this test genuinely useful for a lake community. First, it converts an argument into a number — beach signage, swim advisories, and conversations with a health department all require a count, not a concern. Second, sampled repeatedly at several sites, it points to sources: bacteria that spike at one shoreline location after rain and nowhere else is telling you something specific about that shoreline.

What's included?

• A complete E. Coli and Coliform Enumeration test kit with sterile sample container
• All materials required for clean, contamination-free sample collection
• Step-by-step collection and preservation instructions
• Prepaid 1-day return shipping to our certified partner laboratory — expedited specifically because bacteria samples have a short holding time
• Analysis by EPA-approved methods at an accredited partner laboratory, with full chain of custody
• Results loaded automatically into your lake's account

What's not included

• Sample collection. You collect the sample; we supply everything you need to do it correctly.
• Boat, dock, or shoreline access to your sampling site
• Depth-profile sampling. This is a single grab sample unless you order multiple kits.
• Ice or a cooler for shipping, which you supply
• Treatment, remediation, or applicator services
• A written management plan. The Boathouse can help you interpret results and decide next steps.
• Source identification. This tells you bacteria are present, not whose they are. Microbial source tracking is a separate analysis.
• Enterococcus, the indicator used for marine and some freshwater beach programs
• Regulatory certification of a beach. Official advisories are issued by your local health authority.
• Viruses, protozoa, or specific pathogens

Requirements

• READ THIS FIRST — bacteria samples have a short holding time, which is why this kit ships back 1-day rather than 2-day. Standard methods allow a maximum of 24 hours between collection and analysis for informational monitoring. Collect in the morning, get the sample to the carrier the same day, and 1-day return keeps you inside that window.
• If you need a result for an official beach advisory, closure, or regulatory submission, the applicable window is tighter — commonly 6 hours — and no shipped sample can meet it. That requires a certified local lab. Contact the Lake Pulse Boathouse and we will help you find one in your area.
• A sterile container, filled without rinsing and without touching the inside of the container or cap
• Collection at roughly 12 inches below the surface in water about waist to chest deep, which is the standard recreational sampling convention
• Immediate chilling to 4 degrees C and shipment the same day
• A Plus, Lake Admin, or PRO subscription to have results loaded into your Lake Pulse account
• Questions about site selection, timing, or which test fits your lake? Contact the Lake Pulse Boathouse before you order.