Checked WaterIndependent guides to home water: what's in your tap or well water, how to test it, and which filters and softeners are certified to fix it.https://checkedwater.com/Best Reverse Osmosis Systems, Checked Against Their Certificationshttps://checkedwater.com/water-filters/reverse-osmosis/best-reverse-osmosis-systems/https://checkedwater.com/water-filters/reverse-osmosis/best-reverse-osmosis-systems/We checked six popular home RO systems against their NSF, WQA and IAPMO listings: what each is certified for, filter costs, wastewater and who it suits.Fri, 09 Oct 2026 00:00:00 GMTHow Reverse Osmosis Works: What It Removes and What It Wasteshttps://checkedwater.com/water-filters/reverse-osmosis/how-reverse-osmosis-works/https://checkedwater.com/water-filters/reverse-osmosis/how-reverse-osmosis-works/How a home reverse osmosis system works, what it removes and misses, how much water goes down the drain, and how to tell if you need one.Thu, 08 Oct 2026 00:00:00 GMTHard Water: What It Does (and Doesn't Do) and How to Fix Ithttps://checkedwater.com/water-softeners/hard-water/https://checkedwater.com/water-softeners/hard-water/Hard water is calcium and magnesium, not a health hazard. What it does to pipes, skin and hair, how to test it, and when a softener is worth it.Thu, 08 Oct 2026 00:00:00 GMTHow to Read Your Water Quality Report (CCR), Step by Stephttps://checkedwater.com/water-testing/how-to-read-your-water-quality-report/https://checkedwater.com/water-testing/how-to-read-your-water-quality-report/What MCL, MCLG, action level and range mean in your utility's water quality report, when it arrives, what changes in 2027 and what it can't tell you.Thu, 08 Oct 2026 00:00:00 GMTWell Water Testing: What to Test For and How Oftenhttps://checkedwater.com/well-water/well-water-testing/https://checkedwater.com/well-water/well-water-testing/Nobody tests a private well but you. What to test every year, what to add for your area, when to test again, how to sample, and how to read the results.Thu, 08 Oct 2026 00:00:00 GMTLead in Drinking Water: Sources, Testing and Filters That Workhttps://checkedwater.com/whats-in-your-water/lead-in-drinking-water/https://checkedwater.com/whats-in-your-water/lead-in-drinking-water/Where lead in tap water comes from, what the 2024 lead rule changes, how to check your service line and test, and how to pick a filter certified for lead.Thu, 08 Oct 2026 00:00:00 GMTPFAS in Drinking Water: What They Are and What the EPA Rules Sayhttps://checkedwater.com/whats-in-your-water/pfas-in-drinking-water/https://checkedwater.com/whats-in-your-water/pfas-in-drinking-water/PFAS are long-lasting chemicals found in some US tap and well water. What the research shows, where EPA limits stand in 2026 and how to check your water.Thu, 08 Oct 2026 00:00:00 GMTEPA's 2026 PFAS Proposals: What Changes for Your Tap Waterhttps://checkedwater.com/news/epa-pfas-drinking-water-rule-2026/https://checkedwater.com/news/epa-pfas-drinking-water-rule-2026/The EPA proposed in May 2026 to keep its PFOA and PFOS limits, allow more time and drop four other PFAS limits. Where that stands and what to check.Thu, 08 Oct 2026 00:00:00 GMT