House On The Rock Resort, WI
Exceeded the action level in the past
Latest 90th-percentile lead: 1.78 ppb (monitoring period 2021-2021). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
House On The Rock Resort at a glance
House On The Rock Resort serves about 470 people through 55 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Iowa County, Wisconsin. EPA system ID: WI1250318. Ask the utility on your bill for your address in their service line inventory.
House On The Rock Resort's lead record
Against the period ending 2021 (1.09 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for House On The Rock Resort is 18.1 ppb across 11 monitoring periods, 2 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2021 | 1.78 ppb |
| 2021 | 1.09 ppb |
| 2020 | 1.02 ppb |
| 2020 | 5.63 ppb |
| 2019 | 6.73 ppb |
| 2019 | 13.31 ppb over 10 |
| 2018 | 10.85 ppb over 10 |
| 2018 | 10.31 ppb over 10 |
| 2017 | 7.59 ppb |
| 2017 | 15.8 ppb over 15 |
| 2016 | 18.1 ppb over 15 |
How House On The Rock Resort compares
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. House On The Rock Resort's 1.78 ppb sits at the 58th percentile in Wisconsin and the 67th nationally (higher means more lead).
Neighbouring systems
14 other systems share Iowa County; 5 of them have a higher latest lead result than House On The Rock Resort. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Dodgeville Waterworks | 4,583 | 1.4 ppb |
| Mineral Point Waterworks | 2,487 | 37 ppb |
| Barneveld Waterworks | 1,258 | 1.9 ppb |
| Arena Waterworks | 877 | 1.1 ppb |
| Highland Waterworks | 842 | 0 (not detected) |
| Ridgeway Waterworks | 690 | 3.48 ppb |
| Linden Waterworks | 547 | 2.2 ppb |
| Avoca Waterworks | 545 | 0 (not detected) |
| Cobb Waterworks | 458 | 0 (not detected) |
| Rewey Waterworks | 290 | 0 (not detected) |
Next steps for Spring Green, WI
Test your own tap with a certified lab first-draw sample; Spring Green, 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 House On The Rock Resort 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. Why an old exceedance still matters: over the limit before, under it now.