When E. coli Isn’t Harmless. Why the Lymington River Findings Matter

We’ve now been measuring E.coli for 6 months. We know it's important but following a talk at St Barbes’ Climate Chats, Charlotte stepped forward with this compelling personal account. It highlights the significance of our mission.

"In 2022, I was living and working in Madagascar for two months, overseeing the work of the NGO I founded, Small Steps for Africa, in communities near the capital, Antananarivo.  Halfway through my stay, I contracted Shiga-Toxin Producing (STEC) E. coli, likely from contaminated water.

For three days I was violently unwell — bed bound, severely dehydrated, unable to keep down food or water. I probably should have gone to hospital, but I felt too weak to move for most of that time. Eventually the acute illness subsided. What followed was arguably much worse.

The infection had effectively stripped my gut of its healthy bacteria. As is common with many strains circulating in Madagascar, the E. coli proved antibiotic resistant, meaning treatment was not an option. Over the following weeks my digestive system functioned progressively less well. I was reduced to eating only small amounts of soup, smoothies and stews.

I lost half a kilogram per week for four months — a total of 20% of my body weight. Doctors feared cancer or colitis. Tests at the National Tropical Medicine Hospital in London eventually confirmed that this was instead the long-term impact of a severe E. coli infection.

It took almost a year before I could tolerate proper solid food again, and two years before I could eat anything approaching a normal portion size. Even now, I live with ongoing consequences: new gluten intolerance, a worsened shellfish allergy, low B12 levels, difficulty digesting fatty foods, and permanently reduced portion sizes.

We often talk about E. coli as a common, harmless infection, and for many people, it is. But for some, it is not."

Why This Is Relevant to the Lymington River

This is why our recent findings of extremely high E. coli levels in the Lymington River should concern us.  When we measure elevated E. coli concentrations, we are not just recording numbers. We are identifying faecal contamination in a river used by swimmers, paddleboarders, kayakers, anglers, dog walkers and children. High readings indicate that sewage or animal waste is entering the water system. With that contamination comes the risk of exposure to harmful strains.

Not every strain produces Shiga toxin. Not every exposure results in severe illness. But when levels are repeatedly and significantly elevated, the risk increases, particularly for children, older adults, and those with compromised immune systems.

As water-based recreation becomes more popular, and as heavier rainfall events increasingly overwhelm drainage and sewer infrastructure, we cannot afford to dismiss high E. coli readings as routine background noise. They are indicators of a wider problem.

It Is Not Only About Human Health

Elevated faecal contamination also affects wildlife. Rivers are complex ecosystems. Persistent microbial pollution and associated nutrient loading can disrupt invertebrate populations, stress fish, degrade habitats and alter ecological balance.

A river consistently recording very high E. coli levels is rarely suffering from a single isolated issue. It usually signals broader systemic pressures - from infrastructure, runoff, or overflow events - that affect the entire ecosystem.

When we ignore those signals, we ignore the health of the river itself.

Why Monitoring Matters

Monitoring is not about creating alarm. It is about providing evidence.  If we do not measure contamination, we cannot identify patterns.  If we do not identify patterns, we cannot address causes.  If we do not address causes, risks persist, to people and to wildlife.

Charlotte’s experience was severe, and thankfully uncommon. But it demonstrates something important: E. coli is not always harmless. When we see extremely high readings in the Lymington River, we should take notice, not because panic is helpful, but because evidence demands attention. 

Safe, healthy rivers require vigilance. And sometimes, the data is telling us something we cannot afford to ignore.