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Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
EPA records for COTTONWOOD MUNICIPAL WATER CW1 • Updated September 2026
Grade A — based on EPA compliance records, lead testing and PFAS monitoring
COTTONWOOD MUNICIPAL WATER CW1 has a clean recent record: no health-based violations in the last five years and no lead, PFAS or historical monitoring result that costs it more than a few points.
Yes — by EPA's records, Cottonwood's tap water earns a A: no health-based violations in five years, lead at 0 ppb (90th percentile) and only low-level PFAS (PFPeA). Lead from home plumbing is the main remaining risk.
By EPA's records, yes. COTTONWOOD MUNICIPAL WATER CW1 earns a A: no health-based violations in the last five years, a lead 90th-percentile result of 0 ppb, and PFAS (PFPeA) below federal limits. Lead from your own plumbing is the main risk city data cannot see.
COTTONWOOD MUNICIPAL WATER CW1's most recent Lead and Copper Rule result (2021-01-01 to 2023-12-31) was 0 ppb at the 90th percentile, below EPA's 15 ppb action level. Because lead usually comes from service lines and household plumbing, homes built before 1986 should still test at the tap.
Yes. EPA's UCMR5 sampling (2025-03-10 to 2025-09-16) detected PFPeA, all below federal MCLs. Reverse osmosis and certified activated-carbon filters reduce PFAS.
COTTONWOOD MUNICIPAL WATER CW1 has 10 violations on file since 2016: 0 health-based in the last five years and 0 monitoring or reporting violations in that window. Monitoring violations are paperwork lapses, not measured contamination.
COTTONWOOD MUNICIPAL WATER CW1 reports groundwater as its primary source and serves about 11,023 people (EPA PWSID AZ0413025).
Optional but sensible. The findings on this page are below federal limits; an NSF-certified pitcher or under-sink filter handles PFAS, arsenic and improves taste.
Want to know what's really in your Cottonwood tap water?
PFPeA were detected in Cottonwood's water at low levels in 2023–2025 EPA monitoring.
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COTTONWOOD MUNICIPAL WATER CW1 · SDWIS records since 2016 · 5-year window starts 2021-09-07
EPA records no health-based violations for this system in the last five years. Older health-based violations (since 2016) are listed below for context.
| Violation | Category | Compliance period | Status |
|---|---|---|---|
| Maximum Contaminant Level Violation, AverageArsenic | MCL exceeded | 2021-04-01 → 2021-06-30 | Resolvedreturned 2021-06-30 |
| Maximum Contaminant Level Violation, AverageArsenic | MCL exceeded | 2021-01-01 → 2021-03-31 | Resolvedreturned 2021-03-31 |
| Maximum Contaminant Level Violation, AverageArsenic | MCL exceeded | 2021-01-01 → 2021-03-31 | Resolvedreturned 2021-03-31 |
| Maximum Contaminant Level Violation, AverageArsenic | MCL exceeded | 2020-10-01 → 2020-12-31 | Resolvedreturned 2020-12-31 |
| Monitoring, RegularArsenic | Monitoring & reporting | 2018-01-01 → 2018-03-31 | Resolvedreturned 2018-03-31 |
| Monitoring, RegularArsenic | Monitoring & reporting | 2018-01-01 → 2018-03-31 | Resolvedreturned 2018-03-31 |
| Monitoring, RegularArsenic | Monitoring & reporting | 2018-01-01 → 2018-03-31 | Resolvedreturned 2018-03-31 |
| Monitoring, RegularArsenic | Monitoring & reporting | 2018-01-01 → 2018-03-31 | Resolvedreturned 2018-03-31 |
| Report Sample Result/Fail Monitor (RTCR)Revised Total Coliform Rule | Reporting | 2017-10-01 | Resolvedreturned 2017-12-05 |
| Report Sample Result/Fail Monitor (RTCR)Revised Total Coliform Rule | Reporting | 2016-12-01 | Resolvedreturned 2017-01-18 |
Source: ECHO SDWA bulk download (SDWA_VIOLATIONS_ENFORCEMENT.csv, SDWIS 2026Q2, file dated 2026-07-09, fetched 2026-09-06)
EPA Lead and Copper Rule 90th-percentile results reported by COTTONWOOD MUNICIPAL WATER CW1
Well below the 15 ppb action level. In the most recent monitoring period on file (2021-01-01 to 2023-12-31), 90% of the homes COTTONWOOD MUNICIPAL WATER CW1 sampled had lead at or below 0 ppb.
EPA's action level is 15 ppb (dropping to 10 ppb under the 2024 Lead and Copper Rule Improvements). There is no safe level of lead; the 90th-percentile figure describes the system, not your tap — homes with lead service lines or pre-1986 plumbing can be higher.
| Monitoring period | Lead 90th percentile | vs 15 ppb action level |
|---|---|---|
| 2021-01-01 → 2023-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2020-01-01 → 2022-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2017-01-01 → 2019-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2016-01-01 → 2018-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2015-01-01 → 2017-12-31 | 2.6 ppb | Well below the 15 ppb action level |
| 2014-01-01 → 2016-12-31 | 3.1 ppb | Well below the 15 ppb action level |
| 2013-01-01 → 2015-12-31 | 3.1 ppb | Well below the 15 ppb action level |
| 2012-01-01 → 2014-12-31 | 3 ppb | Well below the 15 ppb action level |
| 2011-01-01 → 2013-12-31 | 3 ppb | Well below the 15 ppb action level |
| 2010-01-01 → 2012-12-31 | 3 ppb | Well below the 15 ppb action level |
| 2009-01-01 → 2011-12-31 | 2 ppb | Well below the 15 ppb action level |
| 2008-01-01 → 2010-12-31 | 2 ppb | Well below the 15 ppb action level |
Source: ECHO SDWA bulk download (SDWA_LCR_SAMPLES.csv, SDWIS 2026Q2, file dated 2026-07-09, fetched 2026-09-06)
EPA UCMR5 monitoring, 2025-03-10 to 2025-09-16 · 290 PFAS results at entry points to the distribution system
PFPeA detected at low levels; no compound was at or above its federal MCL. Detections below the MCL are common in surface-water systems and are reported here exactly as EPA published them.
| Compound | Detects / samples | Max (ppt) | Reporting limit | EPA MCL |
|---|---|---|---|---|
| PFOA | 0 / 10 | < 4 | 4 ppt | 4 ppt |
| PFOS | 0 / 10 | < 4 | 4 ppt | 4 ppt |
| PFHxS | 0 / 10 | < 3 | 3 ppt | 10 ppt |
| PFNA | 0 / 10 | < 4 | 4 ppt | 10 ppt |
| HFPO-DA | 0 / 10 | < 5 | 5 ppt | 10 ppt |
| PFBS | 0 / 10 | < 3 | 3 ppt | hazard index only |
| PFPeA | 1 / 10 | 3.2 | 3 ppt | hazard index only |
“< 4 ppt” means below the laboratory reporting limit, not zero. ppt = parts per trillion (ng/L). Results are for finished water leaving the treatment plant.
Lithium (also monitored under UCMR5, not a PFAS): detected in 10 of 10 samples, max 51.5 µg/L. There is no federal limit for lithium.
What PFAS are and how to remove them → · Best filters for PFAS →
Source: UCMR5 occurrence data, EPA Data Summary July 2026 (UCMR5_All.txt)
EPA Six-Year Review 4 compliance samples for COTTONWOOD MUNICIPAL WATER CW1 · finished water only · dated data, released 2024
These are the regulated-contaminant samples COTTONWOOD MUNICIPAL WATER CW1 reported to its state between 2012 and 2019 — the most recent nationwide sample-level dataset EPA has published. Arsenic is flagged below; the status column explains why. Treat this as history, not today's tap water.
| Contaminant | Samples | Average | Max | EPA limit | Status |
|---|---|---|---|---|---|
| Arsenic | 158127 detects | 4.742 µg/L | 14 µg/L | 10 µg/LMCL | 6 of 158 samples over MCL |
| Nitrate (as N) | 3631 detects | 0.343 mg/L | 0.89 mg/L | 10 mg/LMCL | Within MCL |
| Fluoride | 11 | 0.299 mg/L | 0.46 mg/L | 4 mg/LMCL | Within MCL |
| Chromium (total) | 119 detects | 6.509 µg/L | 13 µg/L | 100 µg/LMCL | Within MCL |
| Radium-226/228 | 101 detects | 0.06 pCi/L | 0.6 pCi/L | 5 pCi/LMCL | Within MCL |
| Total trihalomethanes (TTHM) | 229 detects | 1.481 µg/L | 9.8 µg/L | 80 µg/LMCL (LRAA) | Within MCL |
| Haloacetic acids (HAA5) | 222 detects | 0.114 µg/L | 1.4 µg/L | 60 µg/LMCL (LRAA) | Within MCL |
| Lead (tap samples) | 6434 detects | 1.444 µg/L | 21 µg/L | 15 µg/Laction level (90th percentile) | Reported, not scored (compliance is on the 90th percentile) |
| Copper (tap samples) | 6463 detects | 142.984 µg/L | 840 µg/L | 1300 µg/Laction level (90th percentile) | Reported, not scored (compliance is on the 90th percentile) |
Averages count non-detects as zero. TTHM and HAA5 limits are locational running annual averages, so a single high sample is not a violation — we grade those on the average only. Lead and copper rows are individual tap samples and are shown for context; compliance (and our score) uses the 90th-percentile result above. LRAA = locational running annual average; ND = not detected.
Source: SYR4 Six-Year Review compliance monitoring data 2012–2019 (released 2024-03)
COTTONWOOD MUNICIPAL WATER CW1 · 5,258 service lines inventoried · Q2 2026 snapshot
COTTONWOOD MUNICIPAL WATER CW1 reports no confirmed lead service lines, but 2,157 lines (41%) have not yet been verified, so lead cannot be ruled out for those homes. Utilities must keep investigating unknown lines under EPA's Lead and Copper Rule Improvements.
Source: EPA SDWIS Service Line Inventory (Q2 2026) · PWS ID AZ0413025 · See all Arizona lead service lines. We may earn a commission from filters and test kits, at no extra cost to you.
Groundwater systems draw from wells; naturally occurring arsenic, nitrate, radium and uranium are the readings to watch, along with PFAS near industrial or military sites.
How to test your tap water and the treatment options that actually fit Cottonwood homes
The most reliable way to know what is actually coming out of your tap is a certified mail-in lab test. City-wide EPA data (like the report above) reflects the water leaving the treatment plant, but contaminants such as lead and copper can be picked up from your own service line and household plumbing — so the water at your Cottonwood faucet can differ from the system average. A state-certified lab measures dozens of contaminants at once with results you can trust; you can also find one near you through the EPA's certified-lab list at epa.gov/dwlabcert. Hardware-store test strips are cheaper and instant, but they only screen for a few basics (chlorine, hardness, pH, and a rough lead pass/fail) and are far less accurate — treat them as a first look, not a diagnosis.
Match the treatment to what your test finds. Reverse osmosis (RO) removes the widest range of contaminants — lead, arsenic, nitrate, PFAS, and dissolved solids — which makes an under-sink reverse osmosis system the most thorough choice for Cottonwood households with heavy-metal or PFAS concerns. If your main issue is taste, odor, or chlorine, an activated carbon filter (pitcher, faucet, or under-sink) is simpler and cheaper and handles chlorine and many organic compounds well, though carbon alone does not remove arsenic, nitrate, or most PFAS. NSF-certified pitchers rated for lead reduction are the easiest way to start today while you decide on a permanent setup.
We may earn a commission from testing kits and filters purchased through these links, at no extra cost to you.
Cottonwood ranks #7 of 37 graded Arizona cities.
By EPA's records, yes. COTTONWOOD MUNICIPAL WATER CW1 earns a A: no health-based violations in the last five years, a lead 90th-percentile result of 0 ppb, and PFAS (PFPeA) below federal limits. Lead from your own plumbing is the main risk city data cannot see.
COTTONWOOD MUNICIPAL WATER CW1's most recent Lead and Copper Rule result (2021-01-01 to 2023-12-31) was 0 ppb at the 90th percentile, below EPA's 15 ppb action level. Because lead usually comes from service lines and household plumbing, homes built before 1986 should still test at the tap.
Yes. EPA's UCMR5 sampling (2025-03-10 to 2025-09-16) detected PFPeA, all below federal MCLs. Reverse osmosis and certified activated-carbon filters reduce PFAS.
COTTONWOOD MUNICIPAL WATER CW1 has 10 violations on file since 2016: 0 health-based in the last five years and 0 monitoring or reporting violations in that window. Monitoring violations are paperwork lapses, not measured contamination.
COTTONWOOD MUNICIPAL WATER CW1 reports groundwater as its primary source and serves about 11,023 people (EPA PWSID AZ0413025).
Optional but sensible. The findings on this page are below federal limits; an NSF-certified pitcher or under-sink filter handles PFAS, arsenic and improves taste.
PFPeA were detected in Cottonwood's water at low levels in 2023–2025 EPA monitoring.
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