The EPA’s “Maximum Contaminant Levels” are supposed to protect your drinking water. The problem? They haven’t been updated in years, they don’t cover many modern contaminants, and the “safe” levels are based on a 170-pound adult drinking perfect water for 70 years — not real life.
The EPA’s Dirty Secret: Most MCLs Are Unchanged Since 1990
Out of 90+ regulated contaminants, over a dozen have MCLs (Maximum Contaminant Levels) that haven’t been updated since the original 1992 rules. In that same time, research has shown the new safe levels should be drastically lower.
Take chromium-6 (Erin Brockovich’s contaminant). The EPA’s total chromium limit is 100 parts per billion. California set its own public health goal at 0.02 ppb — that’s 5,000 times stricter.
PFAS: The Regulators Are 30 Years Behind
PFAS — the “forever chemicals” linked to cancer, thyroid disease, and immune system damage — went largely unregulated until 2024. The EPA finally set limits at 4 parts per trillion for PFOA and PFOS.
But there are over 12,000 PFAS chemicals. The EPA only regulates 13 of them. Your water utility tests for maybe 2.
What This Means For Your Family
- “Legal” doesn’t mean “safe.” MCLs are compromise numbers set by committees with industry representation.
- Small children and pregnant women are more vulnerable than the “reference adult” EPA standards assume.
- Your water utility’s annual report is not a safety guarantee — it’s a legal compliance document.
Take Control: Test Your Own Water
The only way to truly know what’s in your water is to test it yourself. We recommend home water testing kits for a baseline, plus lab testing for serious concerns like PFAS and lead.
Then filter accordingly. A quality activated carbon filter handles most contaminants. For PFAS specifically, you’ll need reverse osmosis or specialty PFAS-certified media.
The Bottom Line
Government standards are a floor, not a ceiling. Don’t trust a system that admits 4 pptrillion of PFAS is “acceptable.” Test your water, filter your water, and control your own security. That’s what preppers do.