No open health-based violations on EPA record in the last 10 years.
Serves about 3,316 people (1,235 connections) with groundwater from its own wells.
From EPA's record for CA4510007. PurityMap is independent of Cottonwood Water District.
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2 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From October 2024 | Lead and copper rule revisions | – | – | Resolved |
| From August 2018 | E. coli | – | – | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from April 2024 to October 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-04-09 to 2024-10-09 | UCMR5 Analytical Results: COTTONWOOD WATER DISTRICT (CA4510007) |
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Get PurityMap updates about this water system.
Follow this water →Cottonwood Water District's phone number on EPA record is 530-347-3472. Its mailing address is P.O. Box 2130, COTTONWOOD, CA 96022.
According to EPA's record, Cottonwood Water District uses groundwater from its own wells.
EPA's record shows 2 health-based violations for Cottonwood Water District in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. EPA also lists 2 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Cottonwood Water District's latest lead and copper round, which ended in December 2022, was 1.07 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Cottonwood Water District. Its phone number on EPA record is 530-347-3472. Its mailing address on EPA record is P.O. Box 2130, COTTONWOOD, CA 96022. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.