Leaving dog waste in the yard is one of those things that feels low-priority until it isn't. The truth is that a single gram of dog feces contains millions of bacteria — and many of those bacteria pose real risks to the people and pets who use your yard.
Fecal coliform bacteria in a single gram of dog waste
How long parasites like roundworm eggs can survive in soil
Dog waste ranks as the 3rd largest contributor to bacterial contamination in urban waterways
The Bacteria in Dog Waste
Dog feces can carry a range of harmful bacteria that cause illness in both humans and other animals. These don't require direct contact — they can spread through soil, rainwater runoff, and even tracked indoors on shoes or paws.
E. coli
Can cause serious gastrointestinal illness, especially in young children and immunocompromised individuals.
Salmonella
Present in dog waste even in dogs that show no symptoms. Can infect humans through soil contact or contaminated water.
Campylobacter
A leading cause of bacterial diarrheal illness. Dogs are a significant reservoir, and it spreads easily via contaminated environments.
Parasites That Survive in Your Soil
Bacteria aren't the only concern. Dog waste is a primary vector for several parasites that can infect other dogs and — in some cases — humans.
Roundworms (Toxocara)
Eggs shed in dog feces can survive in soil for years. Children who play in contaminated soil are particularly vulnerable. Human infection can cause vision damage.
Hookworms
Larvae can penetrate human skin directly — no ingestion required. Walking barefoot in a contaminated yard is enough to become infected.
Giardia & Cryptosporidium
Protozoan parasites that cause persistent digestive illness. Highly resilient in the environment and easily spread through water runoff.
Whipworms & Tapeworms
Common intestinal parasites in dogs. Segments shed in feces can reinfect your dog repeatedly if waste isn't removed from the yard.
A note on re-infection: If your dog has ever been treated for intestinal parasites and keeps getting them back, the yard itself may be the source. Unremoved waste creates a continuous reinfection cycle — treatment helps the dog, but cleaning the yard breaks the loop.
What It Does to Your Lawn
There's a persistent myth that dog waste fertilizes your lawn. It doesn't — it burns and damages it. Dog waste is highly acidic and high in nitrogen at concentrations that kill grass rather than feed it. The brown, dead patches you see are evidence. Regular removal is the only way to protect the grass you've spent time and money growing.
The Water Contamination Problem
Rain carries bacteria and parasites from dog waste into storm drains, which drain directly into local waterways — including Lake Tapps and the White River. The EPA has classified pet waste as a significant non-point source pollutant. Picking it up isn't just about your yard. It's a shared responsibility for the watershed we all live in.
How Often Should You Remove Dog Waste?
At least weekly. The short answer depends on how many dogs you have, how large your yard is, and how much time your pets spend outside. Weekly service prevents buildup, controls the parasite cycle, and keeps bacterial concentrations low. For most households with one or two dogs, weekly scooping is the gold standard — which is exactly why it's our most popular plan.