Irh Big Cedar, WI

Lead detected, under the action levels

Latest 90th-percentile lead: 2.1 ppb (monitoring period 2025-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.

Irh Big Cedar at a glance

Irh Big Cedar serves about 306 people through 2 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Taney County, Wisconsin. EPA system ID: MO5066376; phone on file: 865-770-2183. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.

Irh Big Cedar's lead record

That is down 2.88 ppb from 4.98 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Irh Big Cedar is 4.98 ppb across 2 monitoring periods, none of them over 15 ppb.

Against other Wisconsin systems

Of the 947 Wisconsin systems with a lead result, the median latest reading is 1.33 ppb; 6 are over 15 ppb right now and 71 have gone over at some point. Irh Big Cedar's 2.1 ppb sits at the 64th percentile in Wisconsin and the 74th nationally (higher means more lead).

Next steps for Lake Delton, WI

Test your own tap with a certified lab first-draw sample; Lake Delton, WI may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Irh Big Cedar whether it covers that cost before hiring anyone - many utilities now do.

These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. What a 90th-percentile result does and does not tell you: how to read a lead result. Size matters more than most people expect: small vs large water systems.