An independent public resourceEnglish Español
PublicWater Watch

San Luis Obispo Water Department

Published drinking-water records and contacts for San Luis Obispo Water Department. System CA4010009. Review sources and dates; not a real-time water assessment.

System ID
CA4010009
State or territory
CA
Published population served
47788
System type (source code)
CWS

Published records and dates

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
SubstancePublished resultReporting limitSample dateSampling location
11Cl-PF3OUdS< 0.005 µg/L0.005 µg/L2024-05-08Treatment Plant / 4010009801
4:2 FTS< 0.003 µg/L0.003 µg/L2024-05-08Treatment Plant / 4010009801
6:2 FTS< 0.005 µg/L0.005 µg/L2024-05-08Treatment Plant / 4010009801
8:2 FTS< 0.005 µg/L0.005 µg/L2024-05-08Treatment Plant / 4010009801
9Cl-PF3ONS< 0.002 µg/L0.002 µg/L2024-05-08Treatment Plant / 4010009801
ADONA< 0.003 µg/L0.003 µg/L2024-05-08Treatment Plant / 4010009801
HFPO-DA< 0.005 µg/L0.005 µg/L2024-05-08Treatment Plant / 4010009801
NEtFOSAA< 0.005 µg/L0.005 µg/L2024-03-06Treatment Plant / 4010009801
NFDHA< 0.02 µg/L0.02 µg/L2024-05-08Treatment Plant / 4010009801
NMeFOSAA< 0.006 µg/L0.006 µg/L2024-03-06Treatment Plant / 4010009801
PFBA< 0.005 µg/L0.005 µg/L2024-05-08Treatment Plant / 4010009801
PFBS< 0.003 µg/L0.003 µg/L2024-05-08Treatment Plant / 4010009801
PFDA< 0.003 µg/L0.003 µg/L2024-05-08Treatment Plant / 4010009801
PFDoA< 0.003 µg/L0.003 µg/L2024-05-08Treatment Plant / 4010009801
PFEESA< 0.003 µg/L0.003 µg/L2024-05-08Treatment Plant / 4010009801
PFHpA< 0.003 µg/L0.003 µg/L2024-05-08Treatment Plant / 4010009801
PFHpS< 0.003 µg/L0.003 µg/L2024-05-08Treatment Plant / 4010009801
PFHxA< 0.003 µg/L0.003 µg/L2024-05-08Treatment Plant / 4010009801
PFHxS< 0.003 µg/L0.003 µg/L2024-05-08Treatment Plant / 4010009801
PFMBA< 0.003 µg/L0.003 µg/L2024-05-08Treatment Plant / 4010009801
PFMPA< 0.004 µg/L0.004 µg/L2024-05-08Treatment Plant / 4010009801
PFNA< 0.004 µg/L0.004 µg/L2024-05-08Treatment Plant / 4010009801
PFOA< 0.004 µg/L0.004 µg/L2024-05-08Treatment Plant / 4010009801
PFOS< 0.004 µg/L0.004 µg/L2024-05-08Treatment Plant / 4010009801
PFPeA< 0.003 µg/L0.003 µg/L2024-05-08Treatment Plant / 4010009801
PFPeS< 0.004 µg/L0.004 µg/L2024-05-08Treatment Plant / 4010009801
PFTA< 0.008 µg/L0.008 µg/L2024-03-06Treatment Plant / 4010009801
PFTrDA< 0.007 µg/L0.007 µg/L2024-03-06Treatment Plant / 4010009801
PFUnA< 0.002 µg/L0.002 µg/L2024-05-08Treatment Plant / 4010009801
lithium< 9 µg/L9 µg/L2024-03-06Treatment Plant / 4010009801

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
SubstancePublished 90th percentileMonitoring periodSource quarter
Lead (PB90) 0 mg/L2023-01-01 – 2025-12-312026Q3
Lead (PB90) 0 mg/L2017-01-01 – 2019-12-312026Q3
Lead (PB90) 0.0011 mg/L2014-01-01 – 2016-12-312026Q3
Lead (PB90) 0.009 mg/L2011-01-01 – 2013-12-312026Q3
Lead (PB90) 0.0018 mg/L2008-01-01 – 2010-12-312026Q3
Lead (PB90) 0.0019 mg/L2005-01-01 – 2007-12-312026Q3
Lead (PB90) 0.0014 mg/L2004-01-01 – 2004-12-312026Q3
Lead (PB90) 0.0014 mg/L2002-01-01 – 2004-12-312026Q3
Twelve most recent imported state laboratory records
SubstancePublished resultSample dateLocation / source
BROMATE< 5.000000000 UG/L2026-07-02TREATMENT PLANT - TREATED / California DDW laboratory results
FLUORIDE0.7 MG/L2026-06-04TREATMENT PLANT - TREATED / California DDW laboratory results
BROMATE< 5.000000000 UG/L2026-06-04TREATMENT PLANT - TREATED / California DDW laboratory results
ALUMINUM120 UG/L2026-06-04TREATMENT PLANT - TREATED / California DDW laboratory results
CARBON, TOTAL3.4 MG/L2026-06-04TREATMENT PLANT - TREATED / California DDW laboratory results
CARBON, TOTAL5.7 MG/L2026-06-04COMBINED TREATMENT PLANT - RAW / California DDW laboratory results
DIBROMOCHLOROMETHANE8 UG/L2026-05-12DBPR Sample / California DDW laboratory results
BROMODICHLOROMETHANE7 UG/L2026-05-12DBPR Sample / California DDW laboratory results
TTHM53 UG/L2026-05-12DBPR Sample / California DDW laboratory results
CHLOROFORM25 UG/L2026-05-12DBPR Sample / California DDW laboratory results
DICHLOROACETIC ACID6 UG/L2026-05-12DBPR Sample / California DDW laboratory results
CHLOROFORM29 UG/L2026-05-12DBPR Sample / California DDW laboratory results

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

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

Source dates and refresh checks

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

Administrative contact (EPA filing)

Boerman, Mychal: 805-781-7237

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