The problem
Lead in tap water typically comes from lead service lines, solder, or older fixtures.
Homes built before 1986 are more likely to have lead solder; service-line material varies by street.
What public data can and cannot say
Can tell you
- Utilities publish lead sampling results and, under the Lead and Copper Rule Improvements, service-line inventories.
- The ZIP report can point to the serving system.
Cannot tell you
- System sampling does not represent every home.
- Inventory status can be listed as unknown.
How to test
- Ask your utility whether it offers lead testing.
- Use a certified lab and follow first-draw sampling instructions.
System types compared
| System type | Format | What to check on the listing | Read |
|---|---|---|---|
| Under-sink RO | Point of use | Seller-listed NSF/ANSI 58 scope that names lead for the exact model | Reviews |
| Carbon block | Point of use | Seller-listed NSF/ANSI 53 scope that names lead | Reviews |
| Service-line replacement | Plumbing | Utility programs; licensed plumber required | Reviews |
Under-sink RO
Seller-listed NSF/ANSI 58 scope that names lead for the exact model
ReviewsCarbon block
Seller-listed NSF/ANSI 53 scope that names lead
ReviewsService-line replacement
Utility programs; licensed plumber required
Reviews
Referred equipment
No product is referred on this guide. Test first; the result decides the system type.
Sources
FAQ
- Should I buy a filter before testing?
- Test first. The result tells you whether to look at plumbing, a utility program, or a point-of-use system with a listed certification.