North Mohave Valley Water System water quality
Bullhead City, AZ · serves 5,190 people (2,218 connections) · Groundwater · Private · EPA ID AZ0408068
Data: U.S. EPA · How we read the data · How we check it
Summary
PFAS above the 2024 federal limits, plus lead above the action level, 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 limitPFOS above the federal limit in EPA's 2023–2025 testing (PFOS 5.2 ppt vs a limit of 4 ppt, where ppt = parts per trillion).
- Lithium
- Above screening levelHighest result 100 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
- Above action level22 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 Jan 2024 – now, still in progress (results reported so far). Your home's pipes can make yours higher.
- Violations
- 1 unresolved2 health-based violations since 2016, most recently Apr 2026.
- 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.
- Lead was above the action level in some homes sampled. 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 North Mohave Valley Water System'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) 763-9400. EPA: how to find it.
PFAS (“forever chemicals”)
EPA UCMR 5: 2 entry points tested Feb 2025 to Aug 2025. "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 Not detected Limit 4 ppt | – |
| PFOS Above limit Limit 4 ppt | 5.2 ppt 1.3× the limit |
| PFHxS Detected, below limit Limit 10 ppt | 3.25 ppt 32% 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 | 0.33 |
| PFBS Detected, below limit Guideline 2,000 ppt | 3.6 ppt |
| PFBA Not detected Guideline 6,000 ppt | – |
| PFHxA Detected, below limit Guideline 3,000 ppt | 1.5 ppt |
| PFPeA Detected, no limit | 3.3 ppt |
For context: the PFOS average is higher than at 90% of the Arizona systems EPA tested.
29 PFAS tested, 5 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 4 of 4 samples. Highest result 100 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: 22 ppb lead (Jan 2024 – now (in progress)). Above action level
| Monitoring period | Lead (90th pct.) |
|---|---|
| Jan 2024 – now (in progress) | 22 ppb |
| Jan 2026 – Jun 2026 | 1.3 ppb |
| Jan 2021 – Dec 2023 | 1.3 ppb |
Earlier results (5)
| Jan 2018 – Dec 2020 | 9.5 ppb |
| Jan 2015 – Dec 2017 | 2.3 ppb |
| Jan 2012 – Dec 2014 | 3 ppb |
| Jan 2009 – Dec 2011 | 1.4 ppb |
| Jan 2006 – Dec 2008 | 2.2 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 |
|---|---|
| Apr 2026 | The system did not complete a required study of how to keep lead and copper from dissolving out of pipes. EPA record: Lead and Copper Rule · OCCT/SOWT Study/Recommendation (limit TT ) Unaddressed |
| Oct 2024 | The system did not publish the required inventory of lead service lines (due October 2024). It says nothing about lead levels in the water. EPA record: Lead and copper rule revisions · LSL Inventory Resolved |
3 unresolved monitoring or reporting violations: Public Notice, Lead and Copper 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
ZIP codes the system reported serving: 86429, 86442
Nearby utilities
- Bullhead City Mohave Water System Bullhead City · same area · PFAS above limit
- City of Lake Havasu Lake Havasu City · 45 mi
- City of Prescott Prescott · 125 mi · PFAS above limit
- Town of Prescott Valley Prescott Valley · 131 mi
- EPCOR – Agua Fria Surprise · 156 mi
- Arizona Water Company – Sedona Sedona · 157 mi · PFAS above limit
Questions
Is North Mohave Valley Water System water safe to drink?
North Mohave Valley Water System 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 North Mohave Valley Water System water have PFAS?
Yes. EPA's 2023–2025 testing of North Mohave Valley Water System found 5 PFAS at least once. The highest entry-point averages were above the federal limit for PFOS: PFOS 5.2 ppt (limit 4 ppt for PFOA and PFOS, 10 ppt for the others).
What is the lead level in North Mohave Valley Water System water?
The most recent 90th-percentile lead result for North Mohave Valley Water System is 22 ppb, for the monitoring period that began Jan 2024 (still in progress). 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 AZ0408068: violations, enforcement and inspections, straight from EPA.
- EPA UCMR 5 data: the PFAS and lithium results (search the file for PWSID AZ0408068).
- EPA SDWIS download: the lead results, population and violation records we use.
- The utility's annual water quality report (Consumer Confidence Report): ask North Mohave Valley Water System at (928) 763-9400, 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.