Public water system record
Knollcrest
Serves Delafield, Waukesha County, WI · 66 people served
Federal records show 1 health-based violation and 1 monitoring/reporting issue for Knollcrest in the last ten years. The most serious issue in this window was a resolved Di(2-ethylhexyl) phthalate violation.
System profile
- Health-based violations, last 10 years
- 1
- Resolved
- 1
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 1
Key facts
- Knollcrest draws water from 1 well.
- Highest measured level in the last 10 years: Di(2-ethylhexyl) phthalate, 10.95 µg/L, federal limit 6 µg/L (1.8 times the limit), 2021.
- Most recent formal enforcement: compliance order with a penalty by Wisconsin, September 2001.
- Record on file since 1991, with 4 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 3 service lines.
Check whether Knollcrest serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Di(2-ethylhexyl) phthalate
Contaminant limit exceeded
Measured 10.95 µg/L, federal limit 6 µg/L (1.8 times the limit)
|
320 | Aug 1, 2021 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
Full record since 1991
EPA's records for Knollcrest go back to 1991. Before October 19, 2016 they list 4 health-based violations (4 resolved) and 83 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 0 | 41 |
| 2000s | 0 | 42 |
| 2010 to October 18, 2016 | 4 | 0 |
| 2020s | 1 | 1 |
Most recent health-based violation before October 19, 2016: Di(2-ethylhexyl) phthalate, began January 2011, Resolved.
Show all 4 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Di(2-ethylhexyl) phthalate
Contaminant limit exceeded
Measured 11.96 µg/L, federal limit 6 µg/L (2 times the limit)
|
Jan 1, 2011 | Resolved |
|
Di(2-ethylhexyl) phthalate
Contaminant limit exceeded
Measured 11.58 µg/L, federal limit 6 µg/L (1.9 times the limit)
|
Oct 1, 2010 | Resolved |
|
Di(2-ethylhexyl) phthalate
Contaminant limit exceeded
Measured 15.85 µg/L, federal limit 6 µg/L (2.6 times the limit)
|
Jul 1, 2010 | Resolved |
|
Di(2-ethylhexyl) phthalate
Contaminant limit exceeded
Measured 15 µg/L, federal limit 6 µg/L (2.5 times the limit)
|
Apr 1, 2010 | Resolved |
Enforcement actions
Wisconsin regulators took 3 formal enforcement actions against Knollcrest between 1999 and 2001, filed as 14 records in EPA's data. The most recent was a compliance order with a penalty in September 2001.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Sep 12, 2001 | Wisconsin | Compliance order with a penalty | 41 violations: Lead and Copper Rule, Nitrate, Total Coliform, 1,2,4-Trichlorobenzene, Tetrachloroethylene |
| May 10, 2000 | Wisconsin | Signed compliance agreement | 2 violations: Nitrate, Lead and Copper Rule |
| Mar 1, 1999 | Wisconsin | Signed compliance agreement | 6 violations: Total Coliform |
What the violations mean
Di(2-ethylhexyl) phthalate
1 incidentTest results for Di(2-ethylhexyl) phthalate were above the federal limit (a maximum contaminant level violation).
The utility had to notify customers about this violation.
Where the water comes from
Knollcrest draws water from 1 well.
Annual water quality report
Knollcrest must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Knollcrest for a copy.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Wisconsin.
Certified drinking water labs by state EPA guidance for private wells