Big Park Water Company water quality
Sedona, AZ · serves 7,392 people (3,214 connections) · Groundwater · Private · EPA ID AZ0413012
Data: U.S. EPA · How we read the data · How we check it
Summary
PFAS above the 2024 federal limits, plus an unresolved health-based violation. Systems have until 2029 to meet the PFAS limits.
Is it an emergency? No: these findings are about longer-term exposure, and nothing in EPA's data calls for you to stop drinking the water today. If your utility ever issues a boil-water or do-not-drink notice, follow it.
- PFAS
- Above limitPFOA above the federal limit in EPA's 2023–2025 testing (PFOA 10.5 ppt vs a limit of 4 ppt, where ppt = parts per trillion).
- Lithium
- Above screening levelHighest result 28 ppb. EPA uses 10 ppb to decide what to study further. It is not a health limit, and there is no federal limit for lithium. About 1 in 4 systems tested were above it.
- Lead
- Below action level0 ppb (parts per billion) at the 90th percentile: 9 in 10 homes sampled were at or below it. Action level 15 ppb, falling to 10 ppb in Nov 2027. Monitoring period ending Dec 2024. Your home's pipes can make yours higher.
- Violations
- 1 unresolved7 health-based violations since 2016, most recently Nov 2025.
- Pregnant, or mixing baby formula with tap water? Babies drink more water for their size, so PFAS exposure matters more for them. Consider bottled water or a filter certified for PFAS for formula, and ask your doctor. Health effects.
- To lower your PFAS exposure now, a home filter certified for PFAS reduction works (reverse osmosis, or activated carbon certified to NSF/ANSI 53 or 58). Filters for these results.
- Built before 1986, or not sure what your service line is made of? Check your service line and test your tap. Utility data can't show your pipes.
- Tested your own tap? Compare your result with these numbers. Moving? Compare this system with another.
- Read Big Park Water Company's annual water quality report (Consumer Confidence Report). It lists every regulated contaminant tested and is usually on the utility's website or mailed with your bill, and you can also request it at (928) 284-2298. EPA: how to find it.
PFAS (“forever chemicals”)
EPA UCMR 5: 5 entry points tested Jan 2023 to Aug 2023. "Average" is the highest entry-point average (non-detects counted as zero), the way EPA compares UCMR 5 results to the limits. ppt = parts per trillion. These results do not determine compliance.
| Contaminant | Highest average |
|---|---|
| PFOA Above limit Limit 4 ppt | 10.5 ppt 2.63× the limit |
| PFOS One sample above limit Limit 4 ppt | 2.05 ppt 51% of the limit |
| PFHxS Detected, below limit Limit 10 ppt | 1.65 ppt 17% of the limit |
| PFNA Not detected Limit 10 ppt | – |
| HFPO-DA (GenX) Not detected Limit 10 ppt | – |
| Hazard Index (a combined score for PFHxS, PFNA, GenX and PFBS, where above 1 is over the limit) Detected, below limit Limit 1 | 0.17 |
| PFBS Detected, below limit Guideline 2,000 ppt | 14 ppt |
| PFBA Not detected Guideline 6,000 ppt | – |
| PFHxA Detected, below limit Guideline 3,000 ppt | 2.3 ppt |
| PFPeA Detected, no limit | 2.3 ppt |
| PFHpA Detected, no limit | 2 ppt |
For context: the PFOA average is higher than at 96% of the Arizona systems EPA tested.
29 PFAS tested, 7 detected at least once. "Not detected" means below EPA's reporting limit (about 2 to 20 ppt depending on the chemical), not proven zero. PFAS not listed were not detected. The limits for PFHxS, PFNA, GenX and the Hazard Index were proposed for rescission in May 2026. That proposal is not final. Systems have until 2029 to meet the limits.
Lithium
Detected in 10 of 10 samples. Highest result 28 ppb. EPA's non-enforceable screening level is 10 ppb. Above screening level The screening level is how EPA decides what to study further, not a health limit. There is no federal limit for lithium and no filter is certified to remove it. About lithium.
Lead and copper
Latest 90th percentile: 0 ppb lead (Jan 2022 – Dec 2024). Below action level
| Monitoring period | Lead (90th pct.) |
|---|---|
| Jan 2022 – Dec 2024 | 0 ppb |
| Jan 2019 – Dec 2021 | 0 ppb |
| Jan 2016 – Dec 2018 | 0 ppb |
Earlier results (7)
| Jan 2013 – Dec 2015 | 1.6 ppb |
| Jan 2010 – Dec 2012 | 2 ppb |
| Jan 2009 – Dec 2011 | 2.2 ppb |
| Jan 2005 – Dec 2007 | 0 ppb |
| Jan 2003 – Dec 2005 | 0 ppb |
| Jan 2002 – Dec 2004 | 2 ppb |
| Jan 2000 – Dec 2002 | 0 ppb |
Lead comes from pipes and fixtures, not the source water, so it varies home to home. The 90th percentile means 9 in 10 sampled homes were at or below it. More on lead.
Violations
| When | What happened |
|---|---|
| Nov 2025 | After positive bacteria tests, the system did not complete the required check of what went wrong. EPA record: Revised Total Coliform Rule · Treatment Technique, Level 1 Assessment (RTCR) Unaddressed |
| Jan 2024 – Oct 2024 5 times | The running annual average for Arsenic was above the legal limit. EPA record: Arsenic · Maximum Contaminant Level Violation, Average · measured 0.011 mg/l (limit 0.010 mg/L) Resolved |
| Jul 2023 | After repeated positive bacteria tests or E. coli, the system did not complete the required detailed investigation. EPA record: Revised Total Coliform Rule · Treatment Technique, Level 2 Assessment (RTCR) Resolved |
2 unresolved monitoring or reporting violations: Public Notice, Consumer Confidence Rule.
Health-based violations mean a contaminant exceeded a limit or a required treatment step was missed. Monitoring and reporting violations mean required tests or reports were late or missing, so the water's quality during that time is unknown. The total includes every violation in EPA's records, most of them paperwork.
Where it serves
Sedona
ZIP codes the system reported serving: 86351
Nearby utilities
- Arizona Water Company – Sedona Sedona · same area · PFAS above limit
- City of Flagstaff Flagstaff · 25 mi
- Town of Prescott Valley Prescott Valley · 35 mi
- City of Prescott Prescott · 41 mi · PFAS above limit
- Town of Payson Payson · 50 mi · PFAS above limit
- City of Peoria Peoria · 80 mi
Questions
Is Big Park Water Company water safe to drink?
Big Park Water Company has 1 unresolved health-based violation on record. EPA testing found PFAS above the 2024 federal limits, which systems must meet by 2029. Federal data can't tell you about your own pipes: lead comes from service lines and plumbing, so test your tap if your home was built before 1986. For the official word, read the utility's annual Consumer Confidence Report.
Does Big Park Water Company water have PFAS?
Yes. EPA's 2023–2025 testing of Big Park Water Company found 7 PFAS at least once. The highest entry-point averages were above the federal limit for PFOA: PFOA 10.5 ppt (limit 4 ppt for PFOA and PFOS, 10 ppt for the others).
What is the lead level in Big Park Water Company water?
The most recent 90th-percentile lead result for Big Park Water Company is 0 ppb, for the period ending Dec 2024. The federal action level is 15 ppb, falling to 10 ppb in November 2027. The 90th percentile means 9 in 10 homes sampled were at or below this number. Individual homes can be higher.
Check these numbers yourself
Every figure on this page comes from public EPA records. You don't have to take our word for it:
- EPA's own report for AZ0413012: violations, enforcement and inspections, straight from EPA.
- EPA UCMR 5 data: the PFAS and lithium results (search the file for PWSID AZ0413012).
- EPA SDWIS download: the lead results, population and violation records we use.
- The utility's annual water quality report (Consumer Confidence Report): ask Big Park Water Company at (928) 284-2298, or see EPA's guide to finding it.
Found something that doesn't match? Tell us and we'll check it against EPA's records. How we check our data.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.