Mt Horeb Waterworks

Published drinking-water records and contacts for Mt Horeb Waterworks. System WI1130247. Review sources and dates; not a real-time water assessment.

System ID: WI1130247
State or territory: WI
Published population served: 7756
System type (source code): CWS

Published records and dates

PFAS / lithium (EPA UCMR 5): 240 — 2024-05-20 – 2024-11-18
Lead and copper monitoring summaries: 24 — 1992-07-01 – 2023-09-30
Wisconsin DNR public-system PFAS records: 72 — 2023-05-08 – 2023-05-08

Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.

Published testing results

Selected recent records are shown below. Different sampling locations and dates are not interchangeable. These excerpts are not a complete testing history.

“<” means below the stated reporting limit, not zero. A reported measurement alone is not a safety verdict. Read an example

EPA UCMR 5 — most recent imported sample per substance
Substance	Published result	Reporting limit	Sample date	Sampling location
11Cl-PF3OUdS	< 0.005 µg/L	0.005 µg/L	2024-11-18	Well 5 (BF547) / EP5
4:2 FTS	< 0.003 µg/L	0.003 µg/L	2024-11-18	Well 4 (BF546) / EP4
6:2 FTS	< 0.005 µg/L	0.005 µg/L	2024-11-18	Well 3 (BF545) / EP3
8:2 FTS	< 0.005 µg/L	0.005 µg/L	2024-11-18	Well 3 (BF545) / EP3
9Cl-PF3ONS	< 0.002 µg/L	0.002 µg/L	2024-11-18	Well 3 (BF545) / EP3
ADONA	< 0.003 µg/L	0.003 µg/L	2024-11-18	Well 4 (BF546) / EP4
HFPO-DA	< 0.005 µg/L	0.005 µg/L	2024-11-18	Well 4 (BF546) / EP4
NEtFOSAA	< 0.005 µg/L	0.005 µg/L	2024-11-18	Well 5 (BF547) / EP5
NFDHA	< 0.02 µg/L	0.02 µg/L	2024-11-18	Well 6 (TO502) / EP6
NMeFOSAA	< 0.006 µg/L	0.006 µg/L	2024-11-18	Well 5 (BF547) / EP5
PFBA	< 0.005 µg/L	0.005 µg/L	2024-11-18	Well 4 (BF546) / EP4
PFBS	< 0.003 µg/L	0.003 µg/L	2024-11-18	Well 6 (TO502) / EP6
PFDA	< 0.003 µg/L	0.003 µg/L	2024-11-18	Well 4 (BF546) / EP4
PFDoA	< 0.003 µg/L	0.003 µg/L	2024-11-18	Well 5 (BF547) / EP5
PFEESA	< 0.003 µg/L	0.003 µg/L	2024-11-18	Well 4 (BF546) / EP4
PFHpA	< 0.003 µg/L	0.003 µg/L	2024-11-18	Well 3 (BF545) / EP3
PFHpS	< 0.003 µg/L	0.003 µg/L	2024-11-18	Well 3 (BF545) / EP3
PFHxA	< 0.003 µg/L	0.003 µg/L	2024-11-18	Well 4 (BF546) / EP4
PFHxS	< 0.003 µg/L	0.003 µg/L	2024-11-18	Well 6 (TO502) / EP6
PFMBA	< 0.003 µg/L	0.003 µg/L	2024-11-18	Well 3 (BF545) / EP3
PFMPA	< 0.004 µg/L	0.004 µg/L	2024-11-18	Well 3 (BF545) / EP3
PFNA	< 0.004 µg/L	0.004 µg/L	2024-11-18	Well 5 (BF547) / EP5
PFOA	< 0.004 µg/L	0.004 µg/L	2024-11-18	Well 6 (TO502) / EP6
PFOS	< 0.004 µg/L	0.004 µg/L	2024-11-18	Well 5 (BF547) / EP5
PFPeA	0.0044 µg/L	0.003 µg/L	2024-11-18	Well 3 (BF545) / EP3
PFPeS	< 0.004 µg/L	0.004 µg/L	2024-11-18	Well 6 (TO502) / EP6
PFTA	< 0.008 µg/L	0.008 µg/L	2024-11-18	Well 6 (TO502) / EP6
PFTrDA	< 0.007 µg/L	0.007 µg/L	2024-11-18	Well 3 (BF545) / EP3
PFUnA	< 0.002 µg/L	0.002 µg/L	2024-11-18	Well 6 (TO502) / EP6
lithium	< 9 µg/L	9 µg/L	2024-11-18	Well 3 (BF545) / EP3

Download all EPA UCMR 5 records (CSV)

Lead and copper: 90th-percentile summaries

These describe a monitoring period across sampled locations, not the result at your home. How to read the 90th percentile

Eight most recent imported monitoring summaries
Substance	Published 90th percentile	Monitoring period	Source quarter
Lead (PB90)	0.003 mg/L	2023-06-01 – 2023-09-30	2026Q3
Lead (PB90)	0.00876 mg/L	2020-07-01 – 2020-10-31	2026Q3
Lead (PB90)	0.0116 mg/L	2017-06-01 – 2017-09-30	2026Q3
Lead (PB90)	0.00744 mg/L	2015-06-01 – 2015-09-30	2026Q3
Lead (PB90)	0.00525 mg/L	2014-06-01 – 2014-09-30	2026Q3
Lead (PB90)	0.00692 mg/L	2013-06-01 – 2013-09-30	2026Q3
Lead (PB90)	0.0132 mg/L	2012-07-01 – 2012-12-31	2026Q3
Lead (PB90)	0.0061 mg/L	2012-01-01 – 2012-06-30	2026Q3

Twelve most recent imported state laboratory records
Substance	Published result	Sample date	Location / source
PFBS	< 0.291 ng/L	2023-05-08	Entry Point / Wisconsin DNR public-system PFAS records
PFHXA	< 0.414 ng/L	2023-05-08	Entry Point / Wisconsin DNR public-system PFAS records
HFPO-DA	< 0.427 ng/L	2023-05-08	Entry Point / Wisconsin DNR public-system PFAS records
PFHPA	< 0.374 ng/L	2023-05-08	Entry Point / Wisconsin DNR public-system PFAS records
PFHXS	0.276 Between LOD and LOQ ng/L	2023-05-08	Entry Point / Wisconsin DNR public-system PFAS records
ADONA	< 0.398 ng/L	2023-05-08	Entry Point / Wisconsin DNR public-system PFAS records
PFNA	< 0.391 ng/L	2023-05-08	Entry Point / Wisconsin DNR public-system PFAS records
PFOS	Below a limit; numeric threshold unavailable ng/L	2023-05-08	Entry Point / Wisconsin DNR public-system PFAS records
9CL-PF3ONS	< 0.294 ng/L	2023-05-08	Entry Point / Wisconsin DNR public-system PFAS records
PFDA	< 0.421 ng/L	2023-05-08	Entry Point / Wisconsin DNR public-system PFAS records
NMEFOSAA	< 0.298 ng/L	2023-05-08	Entry Point / Wisconsin DNR public-system PFAS records
NETFOSAA	< 0.288 ng/L	2023-05-08	Entry Point / Wisconsin DNR public-system PFAS records

State sampling points can include untreated water. Publisher qualifiers and units are retained; consult the full source notes before interpreting a record.

Download state records with source notes (CSV)

Published compliance history

1 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.

Twenty most recent imported compliance records
Rule / record	Period	Recorded status	Health-based (EPA classification)	Source quarter
Public Notice Rule and Revised PN Rule / Public Notification Violation for NPDWR Violation	2011-10-01 – —	Unaddressed	No	2026Q3

Source dates and refresh checks

A refresh check is not a sample date. Publication periods, sample dates and checks are shown separately.

EPA SDWIS lead/copper summaries and service areas — source period: — – —; last checked: 2026-10-17
EPA SDWIS contacts and compliance records — source period: — – —; last checked: 2026-10-17
EPA UCMR 5 sample results — source period: 2023-01-03 – 2026-06-17; last checked: 2026-10-17
Wisconsin DNR public-system PFAS records — last successful check: 2026-10-10

An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.

Official state resources · How to read these records