City of Colusa
Published drinking-water records and contacts for City of Colusa. System CA0610002. Review sources and dates; not a real-time water assessment.
- System ID
- CA0610002
- State or territory
- CA
- Published population served
- 6447
- System type (source code)
- CWS
Published records and dates
- PFAS / lithium (EPA UCMR 5): 300 — 2024-05-06 – 2024-11-04
- Lead and copper monitoring summaries: 17 — 1992-01-01 – 2024-12-31
- California DDW laboratory results: 28 — 2026-01-13 – 2026-04-09
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
| Substance | Published result | Reporting limit | Sample date | Sampling location |
|---|---|---|---|---|
| 11Cl-PF3OUdS | < 0.005 µg/L | 0.005 µg/L | 2024-11-04 | Well 2 Chlorinator / EP1 |
| 4:2 FTS | < 0.003 µg/L | 0.003 µg/L | 2024-11-04 | Well 3 Chlorinator / EP2 |
| 6:2 FTS | < 0.005 µg/L | 0.005 µg/L | 2024-11-04 | Well 5 Chlorinator / EP4 |
| 8:2 FTS | < 0.005 µg/L | 0.005 µg/L | 2024-11-04 | Well 3 Chlorinator / EP2 |
| 9Cl-PF3ONS | < 0.002 µg/L | 0.002 µg/L | 2024-11-04 | Well 2 Chlorinator / EP1 |
| ADONA | < 0.003 µg/L | 0.003 µg/L | 2024-11-04 | Well 3 Chlorinator / EP2 |
| HFPO-DA | < 0.005 µg/L | 0.005 µg/L | 2024-11-04 | Well 2 Chlorinator / EP1 |
| NEtFOSAA | < 0.005 µg/L | 0.005 µg/L | 2024-11-04 | Well 3 Chlorinator / EP2 |
| NFDHA | < 0.02 µg/L | 0.02 µg/L | 2024-11-04 | Well 6 Chlorinator / EP5 |
| NMeFOSAA | < 0.006 µg/L | 0.006 µg/L | 2024-11-04 | Well 6 Chlorinator / EP5 |
| PFBA | < 0.005 µg/L | 0.005 µg/L | 2024-11-04 | Well 4 Chlorinator / EP3 |
| PFBS | < 0.003 µg/L | 0.003 µg/L | 2024-11-04 | Well 4 Chlorinator / EP3 |
| PFDA | < 0.003 µg/L | 0.003 µg/L | 2024-11-04 | Well 5 Chlorinator / EP4 |
| PFDoA | < 0.003 µg/L | 0.003 µg/L | 2024-11-04 | Well 5 Chlorinator / EP4 |
| PFEESA | < 0.003 µg/L | 0.003 µg/L | 2024-11-04 | Well 3 Chlorinator / EP2 |
| PFHpA | < 0.003 µg/L | 0.003 µg/L | 2024-11-04 | Well 6 Chlorinator / EP5 |
| PFHpS | < 0.003 µg/L | 0.003 µg/L | 2024-11-04 | Well 3 Chlorinator / EP2 |
| PFHxA | < 0.003 µg/L | 0.003 µg/L | 2024-11-04 | Well 3 Chlorinator / EP2 |
| PFHxS | < 0.003 µg/L | 0.003 µg/L | 2024-11-04 | Well 2 Chlorinator / EP1 |
| PFMBA | < 0.003 µg/L | 0.003 µg/L | 2024-11-04 | Well 6 Chlorinator / EP5 |
| PFMPA | < 0.004 µg/L | 0.004 µg/L | 2024-11-04 | Well 3 Chlorinator / EP2 |
| PFNA | < 0.004 µg/L | 0.004 µg/L | 2024-11-04 | Well 6 Chlorinator / EP5 |
| PFOA | < 0.004 µg/L | 0.004 µg/L | 2024-11-04 | Well 6 Chlorinator / EP5 |
| PFOS | < 0.004 µg/L | 0.004 µg/L | 2024-11-04 | Well 2 Chlorinator / EP1 |
| PFPeA | < 0.003 µg/L | 0.003 µg/L | 2024-11-04 | Well 4 Chlorinator / EP3 |
| PFPeS | < 0.004 µg/L | 0.004 µg/L | 2024-11-04 | Well 6 Chlorinator / EP5 |
| PFTA | < 0.008 µg/L | 0.008 µg/L | 2024-11-04 | Well 3 Chlorinator / EP2 |
| PFTrDA | < 0.007 µg/L | 0.007 µg/L | 2024-11-04 | Well 2 Chlorinator / EP1 |
| PFUnA | < 0.002 µg/L | 0.002 µg/L | 2024-11-04 | Well 2 Chlorinator / EP1 |
| lithium | < 9 µg/L | 9 µg/L | 2024-11-04 | Well 5 Chlorinator / EP4 |
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
| Substance | Published 90th percentile | Monitoring period | Source quarter |
|---|---|---|---|
| Lead (PB90) | 0.0068 mg/L | 2022-01-01 – 2024-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2019-01-01 – 2021-12-31 | 2026Q3 |
| Lead (PB90) | 0.0008 mg/L | 2016-01-01 – 2018-12-31 | 2026Q3 |
| Lead (PB90) | 0.0117 mg/L | 2013-01-01 – 2015-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2011-01-01 – 2013-12-31 | 2026Q3 |
| Lead (PB90) | 0.0018 mg/L | 2008-01-01 – 2010-12-31 | 2026Q3 |
| Lead (PB90) | 0.0076 mg/L | 2007-01-01 – 2007-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2004-01-01 – 2004-12-31 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| ODOR | < 1.000000000 TON | 2026-04-09 | WELL 05 - 3RD & LARSEN / California DDW laboratory results |
| IRON | 57.5 UG/L | 2026-04-09 | WELL 02 - 8TH & WEBSTER / California DDW laboratory results |
| ARSENIC | 8.0 UG/L | 2026-04-09 | WELL 02 - 8TH & WEBSTER / California DDW laboratory results |
| MANGANESE | 47.5 UG/L | 2026-04-09 | WELL 02 - 8TH & WEBSTER / California DDW laboratory results |
| IRON | < 50.000000000 UG/L | 2026-04-09 | WELL 04 - COLUSA AVE. / California DDW laboratory results |
| ODOR | 1 TON | 2026-04-09 | WELL 03 - 6TH & FREMONT / California DDW laboratory results |
| ODOR | 1 TON | 2026-04-09 | WELL 02 - 8TH & WEBSTER / California DDW laboratory results |
| MANGANESE | 72.5 UG/L | 2026-04-09 | WELL 04 - COLUSA AVE. / California DDW laboratory results |
| PERCHLORATE | < 1.000000000 UG/L | 2026-04-09 | WELL 05 - 3RD & LARSEN / California DDW laboratory results |
| ARSENIC | < 0.500000000 UG/L | 2026-04-09 | WELL 05 - 3RD & LARSEN / California DDW laboratory results |
| MANGANESE | 52.2 UG/L | 2026-04-09 | WELL 03 - 6TH & FREMONT / California DDW laboratory results |
| PERCHLORATE | < 1.000000000 UG/L | 2026-04-09 | WELL 04 - COLUSA AVE. / 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
2 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 |
|---|---|---|---|---|
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2022-03-01 – 2022-03-31 | Resolved | No | 2026Q3 |
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2022-01-01 – 2022-03-31 | 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)
Cain, Jesse: 530-458-4941
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.