E.M. Tharp, Inc.
Published drinking-water records and contacts for E.M. Tharp, Inc.. System CA5403007. Review sources and dates; not a real-time water assessment.
- System ID
- CA5403007
- State or territory
- CA
- Published population served
- 50
- System type (source code)
- NTNCWS
Published records and dates
- Lead and copper monitoring summaries: 8 — 2017-07-01 – 2025-12-31
- California DDW laboratory results: 25 — 2026-01-22 – 2026-06-18
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
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
| Substance | Published 90th percentile | Monitoring period | Source quarter |
|---|---|---|---|
| Lead (PB90) | 0 mg/L | 2023-01-01 – 2025-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2022-01-01 – 2022-12-31 | 2026Q3 |
| Lead (PB90) | 0.0014 mg/L | 2021-01-01 – 2021-12-31 | 2026Q3 |
| Lead (PB90) | 0.0026 mg/L | 2020-01-01 – 2020-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2019-07-01 – 2019-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2019-01-01 – 2019-06-30 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2018-01-01 – 2018-06-30 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2017-07-01 – 2017-12-31 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| NITRATE | 4.2 MG/L | 2026-06-18 | POU - RO - FUEL SHOP SINK / California DDW laboratory results |
| NITRATE | 3.5 MG/L | 2026-06-16 | POE - RO - MAIN OFFICE ICE MACHINE / California DDW laboratory results |
| NITRATE | 39.2 MG/L | 2026-06-15 | POE - RO - MAIN OFFICE ICE MACHINE / California DDW laboratory results |
| NITRATE | 27.6 MG/L | 2026-06-15 | POU - RO - FUEL SHOP SINK / California DDW laboratory results |
| NITRATE | 0.5 MG/L | 2026-05-19 | POE - RO - MAIN OFFICE ICE MACHINE / California DDW laboratory results |
| NITRATE | 0.7 MG/L | 2026-05-13 | POE - RO - MAIN OFFICE ICE MACHINE / California DDW laboratory results |
| NITRATE | 9.1 MG/L | 2026-05-13 | POU - RO - FUEL SHOP SINK / California DDW laboratory results |
| NITRATE | 41.2 MG/L | 2026-05-13 | WELL 01 – BEFORE_RO-POE-POU_NITRATE-TRT / California DDW laboratory results |
| GROSS ALPHA PARTICLE ACTIVITY | 38.3 PCI/L | 2026-05-13 | WELL 01 – BEFORE_RO-POE-POU_NITRATE-TRT / California DDW laboratory results |
| COMBINED URANIUM | 21.5 PCI/L | 2026-05-13 | WELL 01 – BEFORE_RO-POE-POU_NITRATE-TRT / California DDW laboratory results |
| NITRATE | 2.5 MG/L | 2026-04-20 | POE - RO - MAIN OFFICE ICE MACHINE / California DDW laboratory results |
| NITRATE | 0.7 MG/L | 2026-04-15 | POE - RO - MAIN OFFICE ICE MACHINE / 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
8 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.
| Rule / record | Period | Recorded status | Health-based (EPA classification) | Source quarter |
|---|---|---|---|---|
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2021-01-01 – 2021-03-31 | Resolved | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2020-10-01 – 2020-12-31 | Resolved | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2020-07-01 – 2020-09-30 | Resolved | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2020-04-01 – 2020-06-30 | Resolved | Yes | 2026Q3 |
| Revised Total Coliform Rule / Maximum Contaminant Level Violation, E. coli (RTCR) | 2019-07-01 – 2019-07-31 | Resolved | Yes | 2026Q3 |
| Lead and Copper Rule / Initial Tap Sampling for Pb and Cu | 2019-01-01 – — | Resolved | No | 2026Q3 |
| Lead and Copper Rule / Initial Tap Sampling for Pb and Cu | 2018-01-01 – — | Resolved | No | 2026Q3 |
| Lead and Copper Rule / Initial Tap Sampling for Pb and Cu | 2017-07-01 – — | Resolved | 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
- California DDW laboratory results — last successful check: 2026-10-18
Administrative contact (EPA filing)
Ybarra, Olivia: 559-782-5800
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.