Many of us are turning to tap water as an eco-alternative to bottled water, which is a very good thing. And many of us are using water filtration pitchers and faucet devices to filter the water, which means pricey filters that need to be replaced and disposed of on a frequent basis. Before filtering, find out if your tap water even needs to be filtered. Inexpensive at-home water testing kits from the home improvement store can tell you exactly how clean your water is. You might be surprised to learn your tap water is perfectly safe to drink.