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Atascadero Mutual Water Co

Published drinking-water records and contacts for Atascadero Mutual Water Co. System CA4010002. Review sources and dates; not a real-time water assessment.

System ID
CA4010002
State or territory
CA
Published population served
30618
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/L2023-10-11Treatment Building B / 4010002023
4:2 FTS< 0.003 µg/L0.003 µg/L2023-10-11Treatment Building D / 4010002025
6:2 FTS< 0.005 µg/L0.005 µg/L2023-10-11Treatment Building A / 4010002022
8:2 FTS< 0.005 µg/L0.005 µg/L2023-10-11Treatment Building D / 4010002025
9Cl-PF3ONS< 0.002 µg/L0.002 µg/L2023-10-11Treatment Building B / 4010002023
ADONA< 0.003 µg/L0.003 µg/L2023-10-11Treatment Building A / 4010002022
HFPO-DA< 0.005 µg/L0.005 µg/L2023-10-11Treatment Building B / 4010002023
NEtFOSAA< 0.005 µg/L0.005 µg/L2023-10-11Treatment Building A / 4010002022
NFDHA< 0.02 µg/L0.02 µg/L2023-10-11Treatment Building A / 4010002022
NMeFOSAA< 0.006 µg/L0.006 µg/L2023-10-11Treatment Building B / 4010002023
PFBA0.0100 µg/L0.005 µg/L2023-10-11Treatment Building C / 4010002024
PFBS< 0.003 µg/L0.003 µg/L2023-10-11Treatment Building B / 4010002023
PFDA< 0.003 µg/L0.003 µg/L2023-10-11Treatment Building A / 4010002022
PFDoA< 0.003 µg/L0.003 µg/L2023-10-11Treatment Building D / 4010002025
PFEESA< 0.003 µg/L0.003 µg/L2023-10-11Treatment Building A / 4010002022
PFHpA< 0.003 µg/L0.003 µg/L2023-10-11Treatment Building B / 4010002023
PFHpS< 0.003 µg/L0.003 µg/L2023-10-11Treatment Building A / 4010002022
PFHxA< 0.003 µg/L0.003 µg/L2023-10-11Treatment Building B / 4010002023
PFHxS0.0076 µg/L0.003 µg/L2023-10-11Treatment Building C / 4010002024
PFMBA< 0.003 µg/L0.003 µg/L2023-10-11Treatment Building D / 4010002025
PFMPA< 0.004 µg/L0.004 µg/L2023-10-11Treatment Building C / 4010002024
PFNA< 0.004 µg/L0.004 µg/L2023-10-11Treatment Building A / 4010002022
PFOA< 0.004 µg/L0.004 µg/L2023-10-11Treatment Building D / 4010002025
PFOS0.0051 µg/L0.004 µg/L2023-10-11Treatment Building A / 4010002022
PFPeA< 0.003 µg/L0.003 µg/L2023-10-11Treatment Building B / 4010002023
PFPeS< 0.004 µg/L0.004 µg/L2023-10-11Treatment Building B / 4010002023
PFTA< 0.008 µg/L0.008 µg/L2023-10-11Treatment Building D / 4010002025
PFTrDA< 0.007 µg/L0.007 µg/L2023-10-11Treatment Building D / 4010002025
PFUnA< 0.002 µg/L0.002 µg/L2023-10-11Treatment Building C / 4010002024
lithium< 9 µg/L9 µg/L2023-10-11Treatment Building B / 4010002023

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/L2026-01-01 – 2026-12-312026Q3
Lead (PB90) 0 mg/L2025-01-01 – 2025-12-312026Q3
Lead (PB90) 0 mg/L2024-07-01 – 2024-12-312026Q3
Lead (PB90) 0 mg/L2024-01-01 – 2024-06-302026Q3
Lead (PB90) 0 mg/L2023-07-01 – 2023-12-312026Q3
Lead (PB90) 0 mg/L2023-01-01 – 2023-06-302026Q3
Lead (PB90) 0 mg/L2022-07-01 – 2022-12-312026Q3
Lead (PB90) 0 mg/L2022-01-01 – 2022-06-302026Q3
Twelve most recent imported state laboratory records
SubstancePublished resultSample dateLocation / source
TRANS-1,2-DICHLOROETHYLENE< 0.500000000 UG/L2026-07-07WELL 06A / California DDW laboratory results
BERYLLIUM, TOTAL< 1.000000000 UG/L2026-07-07WELL 06A / California DDW laboratory results
MERCURY< 1.000000000 UG/L2026-07-07WELL 06A / California DDW laboratory results
METHYL TERT-BUTYL ETHER< 3.000000000 UG/L2026-07-07WELL 06A / California DDW laboratory results
MANGANESE< 10.000000000 UG/L2026-07-07WELL 06A / California DDW laboratory results
P-DICHLOROBENZENE< 0.500000000 UG/L2026-07-07WELL 06A / California DDW laboratory results
CONDUCTIVITY @ 25 C UMHOS/CM1200 UMHO/CM2026-07-07WELL 06A / California DDW laboratory results
ALUMINUM< 50.000000000 UG/L2026-07-07WELL 06A / California DDW laboratory results
NITRATE5.0 MG/L2026-07-07WELL 06A / California DDW laboratory results
CARBON TETRACHLORIDE< 0.500000000 UG/L2026-07-07WELL 06A / California DDW laboratory results
HYDROXIDE AS CALCIUM CARBONATE< 5.000000000 MG/L2026-07-07WELL 06A / California DDW laboratory results
COPPER, FREE< 50.000000000 UG/L2026-07-07WELL 06A / 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)

Powers, Cheryl: 805-400-5851

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