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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 GILBERT, TOWN OF • Updated September 2026
Grade D — based on EPA compliance records, lead testing and PFAS monitoring
GILBERT, TOWN OF has notable problems in EPA's records — health-based violations, elevated lead or PFAS above the federal limit. A certified filter is a reasonable precaution.
Gilbert's tap water grades D on EPA's records. PFOA or PFOS was measured at or above the 4 ppt federal limit. A certified filter matched to those issues is a sensible precaution.
Gilbert grades D. PFOA or PFOS was measured at or above the 4 ppt federal limit. The water is legal to drink, but a certified filter matched to these findings is a reasonable precaution.
GILBERT, TOWN OF's most recent Lead and Copper Rule result (2023-01-01 to 2025-12-31) 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 (2023-11-07 to 2024-11-05) detected PFBA, PFBS, PFHxA, PFOA, PFOS, PFPeA, with PFOA or PFOS at or above the 4 ppt federal MCL. Reverse osmosis and certified activated-carbon filters reduce PFAS.
GILBERT, TOWN OF has 222 violations on file since 2016: 0 health-based in the last five years and 79 monitoring or reporting violations in that window. Monitoring violations are paperwork lapses, not measured contamination.
GILBERT, TOWN OF reports surface water as its primary source and serves about 247,600 people (EPA PWSID AZ0407092).
We recommend one. Reverse osmosis or a PFAS-certified carbon filter addresses the PFAS result.
Want to know what's really in your Gilbert tap water?
PFOA or PFOS was measured at or above EPA's 4 ppt limit in Gilbert's UCMR5 sampling.
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GILBERT, TOWN OF · 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. The 79 violations on file in that window are monitoring or reporting paperwork issues, not measured contaminant exceedances.
| Violation | Category | Compliance period | Status |
|---|---|---|---|
| Report Sample Result/Fail Monitor (RTCR)Revised Total Coliform Rule | Reporting | 2026-02-01 | Unaddressed |
| Monitoring and Reporting (DBP)Bromate | Monitoring & reporting | 2026-01-01 → 2026-01-31 | Archived |
| Lead Consumer NoticeLead and Copper Rule | Monitoring & reporting | 2026-01-01 | Unaddressed |
| Monitoring of Treatment (SWTR-Filter)Surface Water Treatment Rule | Monitoring & reporting | 2025-12-01 → 2025-12-31 | Resolvedreturned 2025-12-31 |
| Monitoring, Turbidity (Enhanced SWTR)Interim Enhanced Surface Water Treatment Rule | Monitoring & reporting | 2025-10-01 → 2025-10-31 | Resolvedreturned 2025-10-31 |
| Monitoring of Treatment (SWTR-Filter)Surface Water Treatment Rule | Monitoring & reporting | 2025-10-01 → 2025-10-31 | Resolvedreturned 2025-10-31 |
| Monitoring, Turbidity (Enhanced SWTR)Interim Enhanced Surface Water Treatment Rule | Monitoring & reporting | 2025-09-01 → 2025-09-30 | Resolvedreturned 2025-09-30 |
| Report Sample Result/Fail Monitor (RTCR)Revised Total Coliform Rule | Reporting | 2025-07-01 | Resolvedreturned 2025-08-29 |
| Monitoring, RegularNitrate | Monitoring & reporting | 2025-04-01 → 2025-06-30 | Resolvedreturned 2025-06-30 |
| Monitoring of Treatment (SWTR-Filter)Surface Water Treatment Rule | Monitoring & reporting | 2025-02-01 → 2025-02-28 | Resolvedreturned 2025-02-28 |
| Monitoring, Turbidity (Enhanced SWTR)Interim Enhanced Surface Water Treatment Rule | Monitoring & reporting | 2024-11-01 → 2024-11-30 | Resolvedreturned 2024-11-30 |
| Monitoring of Treatment (SWTR-Filter)Surface Water Treatment Rule | Monitoring & reporting | 2024-11-01 → 2024-11-30 | Resolvedreturned 2024-11-30 |
| Monitoring, RegularNitrate | Monitoring & reporting | 2024-10-01 → 2024-12-31 | Resolvedreturned 2024-12-31 |
| Monitoring, RegularNitrate | Monitoring & reporting | 2024-10-01 → 2024-12-31 | Resolvedreturned 2024-12-31 |
| Monitoring, RegularNitrate | Monitoring & reporting | 2024-10-01 → 2024-12-31 | Resolvedreturned 2024-12-31 |
| Monitoring, RegularNitrate | Monitoring & reporting | 2024-10-01 → 2024-12-31 | Resolvedreturned 2024-12-31 |
| Monitoring, RegularArsenic | Monitoring & reporting | 2024-10-01 → 2024-12-31 | Resolvedreturned 2024-12-31 |
| Monitoring and Reporting (DBP)CARBON, TOTAL | Monitoring & reporting | 2024-10-01 → 2024-10-31 | Resolvedreturned 2024-10-31 |
| Monitoring, RegularNitrate | Monitoring & reporting | 2024-10-01 → 2024-12-31 | Resolvedreturned 2024-12-31 |
| Monitoring, RegularArsenic | Monitoring & reporting | 2024-10-01 → 2024-12-31 | Resolvedreturned 2024-12-31 |
| Monitoring, RegularNitrate | Monitoring & reporting | 2024-10-01 → 2024-12-31 | Resolvedreturned 2024-12-31 |
| Monitoring, RegularNitrate | Monitoring & reporting | 2024-10-01 → 2024-12-31 | Resolvedreturned 2024-12-31 |
| Report Sample Result/Fail Monitor (RTCR)Revised Total Coliform Rule | Reporting | 2024-07-01 | Resolvedreturned 2024-09-09 |
| Monitoring and Reporting (DBP)CARBON, TOTAL | Monitoring & reporting | 2024-07-01 → 2024-07-31 | Resolvedreturned 2024-07-31 |
| Monitoring and Reporting (DBP)CARBON, TOTAL | Monitoring & reporting | 2024-04-01 → 2024-04-30 | Resolvedreturned 2024-04-30 |
Showing 25 of 222 violations on file. Full record on EPA ECHO.
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 GILBERT, TOWN OF
Well below the 15 ppb action level. In the most recent monitoring period on file (2023-01-01 to 2025-12-31), 90% of the homes GILBERT, TOWN OF 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 |
|---|---|---|
| 2023-01-01 → 2025-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2020-01-01 → 2022-12-31 | 0.28 ppb | Well below the 15 ppb action level |
| 2017-01-01 → 2019-12-31 | 1.41 ppb | Well below the 15 ppb action level |
| 2014-01-01 → 2016-12-31 | 1.2 ppb | Well below the 15 ppb action level |
| 2011-01-01 → 2013-12-31 | 2.5 ppb | Well below the 15 ppb action level |
| 2008-01-01 → 2010-12-31 | 1.8 ppb | Well below the 15 ppb action level |
| 2007-01-01 → 2009-12-31 | 2.4 ppb | Well below the 15 ppb action level |
| 2006-01-01 → 2006-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2004-01-01 → 2004-12-31 | 0 ppb | Well below the 15 ppb action level |
| 2003-01-01 → 2003-12-31 | 11 ppb | Below the action level, but detectable |
| 1993-01-01 → 1993-06-30 | 2.5 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, 2023-11-07 to 2024-11-05 · 1,218 PFAS results at entry points to the distribution system
PFOA and PFOS measured at or above EPA's legal limit in at least one sample. Utilities have until 2029 (2031 under EPA's proposed extension) to comply with the 2024 PFAS rule, so a result above the MCL today is not yet a violation — but it is the number that matters for your health.
| Compound | Detects / samples | Max (ppt) | Reporting limit | EPA MCL |
|---|---|---|---|---|
| PFOA | 1 / 42 | 6.5 | 4 ppt | 4 ppt |
| PFOS | 2 / 42 | 9.8 | 4 ppt | 4 ppt |
| PFHxS | 0 / 42 | < 3 | 3 ppt | 10 ppt |
| PFNA | 0 / 42 | < 4 | 4 ppt | 10 ppt |
| HFPO-DA | 0 / 42 | < 5 | 5 ppt | 10 ppt |
| PFBS | 7 / 42 | 18.1 | 3 ppt | hazard index only |
| PFBA | 2 / 42 | 5.8 | 5 ppt | hazard index only |
| PFHxA | 1 / 42 | 4.4 | 3 ppt | hazard index only |
| PFPeA | 2 / 42 | 6.2 | 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 42 of 42 samples, max 258 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 GILBERT, TOWN OF · finished water only · dated data, released 2024
These are the regulated-contaminant samples GILBERT, TOWN OF reported to its state between 2012 and 2019 — the most recent nationwide sample-level dataset EPA has published. Arsenic, Total trihalomethanes (TTHM) are flagged below; the status column explains why. Treat this as history, not today's tap water.
| Contaminant | Samples | Average | Max | EPA limit | Status |
|---|---|---|---|---|---|
| Arsenic | 203190 detects | 5.836 µg/L | 12 µg/L | 10 µg/LMCL | 4 of 203 samples over MCL |
| Nitrate (as N) | 247240 detects | 3.767 mg/L | 8 mg/L | 10 mg/LMCL | Within MCL |
| Fluoride | 8785 detects | 0.64 mg/L | 1 mg/L | 4 mg/LMCL | Within MCL |
| Chromium (total) | 8771 detects | 7.991 µg/L | 19 µg/L | 100 µg/LMCL | Within MCL |
| Uranium (combined) | 5046 detects | 2.914 µg/L | 7.6 µg/L | 30 µg/LMCL | Within MCL |
| Radium-226/228 | 503 detects | 0.064 pCi/L | 1.8 pCi/L | 5 pCi/LMCL | Within MCL |
| Gross alpha | 5025 detects | 0.562 pCi/L | 3.9 pCi/L | 15 pCi/LMCL | Within MCL |
| Total trihalomethanes (TTHM) | 270269 detects | 44.758 µg/L | 110 µg/L | 80 µg/LMCL (LRAA) | 15 single samples over MCL; average within limit |
| Haloacetic acids (HAA5) | 262244 detects | 10.74 µg/L | 48 µg/L | 60 µg/LMCL (LRAA) | Within MCL |
| Lead (tap samples) | 151114 detects | 0.727 µg/L | 10 µg/L | 15 µg/Laction level (90th percentile) | Reported, not scored (compliance is on the 90th percentile) |
| Copper (tap samples) | 151150 detects | 55.887 µg/L | 336 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)
GILBERT, TOWN OF · 86,557 service lines inventoried · Q2 2026 snapshot
GILBERT, TOWN OF reports no lead or galvanized-requiring-replacement service lines and has classified 89% of its 86,557 lines as non-lead. Lead can still come from pre-1986 plumbing and fixtures inside a home.
Source: EPA SDWIS Service Line Inventory (Q2 2026) · PWS ID AZ0407092 · See all Arizona lead service lines. We may earn a commission from filters and test kits, at no extra cost to you.
Surface-water systems draw from rivers, lakes or reservoirs and must filter and disinfect, which is why disinfection byproducts (TTHM, HAA5) are the readings to watch.
How to test your tap water and the treatment options that actually fit Gilbert 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 Gilbert 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 Gilbert 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.
Gilbert ranks #32 of 37 graded Arizona cities.
Gilbert grades D. PFOA or PFOS was measured at or above the 4 ppt federal limit. The water is legal to drink, but a certified filter matched to these findings is a reasonable precaution.
GILBERT, TOWN OF's most recent Lead and Copper Rule result (2023-01-01 to 2025-12-31) 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 (2023-11-07 to 2024-11-05) detected PFBA, PFBS, PFHxA, PFOA, PFOS, PFPeA, with PFOA or PFOS at or above the 4 ppt federal MCL. Reverse osmosis and certified activated-carbon filters reduce PFAS.
GILBERT, TOWN OF has 222 violations on file since 2016: 0 health-based in the last five years and 79 monitoring or reporting violations in that window. Monitoring violations are paperwork lapses, not measured contamination.
GILBERT, TOWN OF reports surface water as its primary source and serves about 247,600 people (EPA PWSID AZ0407092).
We recommend one. Reverse osmosis or a PFAS-certified carbon filter addresses the PFAS result.
PFOA or PFOS was measured at or above EPA's 4 ppt limit in Gilbert's UCMR5 sampling.
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