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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 WINDSOR TOWN OF • Updated September 2026
Grade A — based on EPA compliance records, lead testing and PFAS monitoring
WINDSOR TOWN OF 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 Windsor, CO tap water is safe to drink and earns an A. The grade rests on lead at 5.8 ppb (90th percentile) — under the 15 ppb action level but above 5 ppb. Lead from your own service line or plumbing is the main risk city-level data cannot see, so homes built before 1986 should still test at the tap.
Yes — by EPA's records Windsor, CO tap water is safe to drink and earns an A. The grade rests on lead at 5.8 ppb (90th percentile) — under the 15 ppb action level but above 5 ppb. Lead from your own service line or plumbing is the main risk city-level data cannot see, so homes built before 1986 should still test at the tap.
WINDSOR TOWN OF's most recent Lead and Copper Rule result (2023-01-01 to 2025-12-31) was 5.8 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.
No. None of the 348 UCMR5 PFAS results for WINDSOR TOWN OF (2023-08-07 to 2024-06-24) were at or above the reporting limit of roughly 3–5 ppt.
WINDSOR TOWN OF has 3 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.
WINDSOR TOWN OF reports purchased surface water as its primary source and serves about 23,500 people (EPA PWSID CO0162843).
Optional but sensible. The findings on this page are below federal limits; an NSF-certified pitcher or under-sink filter handles lead and improves taste.
Compare filter options for your Windsor tap water
Lead was found at 5.8 ppb (90th percentile) in Windsor's latest tap sampling — below the action level, but there is no safe level of lead.
Unsure which contaminants to treat? Compare home kits and certified lab testing before buying.
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WINDSOR TOWN OF · SDWIS records since 2016 · 5-year window starts 2021-09-13
EPA records no health-based violations for this system in the last five years.
| Violation | Category | Compliance period | Status |
|---|---|---|---|
| Public Notification Violation without NPDWR ViolationPublic Notice | Other | 2023-01-09 | Resolvedreturned 2023-02-01 |
| Sample Siting Plan Errors (RTCR)Revised Total Coliform Rule | Other | 2022-12-09 | Resolvedreturned 2023-01-27 |
| Public Notification Violation without NPDWR ViolationPublic Notice | Other | 2020-11-30 | Resolvedreturned 2023-04-27 |
Source: ECHO SDWA bulk download (SDWA_VIOLATIONS_ENFORCEMENT.csv, SDWIS 2026Q2, file dated 2026-07-09, fetched 2026-09-13)
EPA Lead and Copper Rule 90th-percentile results reported by WINDSOR TOWN OF
Below the action level, but detectable. In the most recent monitoring period on file (2023-01-01 to 2025-12-31), 90% of the homes WINDSOR TOWN OF sampled had lead at or below 5.8 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 | 5.8 ppb | Below the action level, but detectable |
| 2021-01-01 → 2021-12-31 | 5.3 ppb | Below the action level, but detectable |
| 2020-01-01 → 2020-12-31 | 3.9 ppb | Well below the 15 ppb action level |
| 2019-01-01 → 2019-12-31 | 4.3 ppb | Well below the 15 ppb action level |
| 2018-01-01 → 2018-12-31 | 2.7 ppb | Well below the 15 ppb action level |
| 2017-01-01 → 2017-12-31 | 3.9 ppb | Well below the 15 ppb action level |
| 2014-01-01 → 2016-12-31 | 6.6 ppb | Below the action level, but detectable |
| 2011-01-01 → 2013-12-31 | 6 ppb | Below the action level, but detectable |
| 2009-01-01 → 2009-12-31 | 6 ppb | Below the action level, but detectable |
| 2008-01-01 → 2008-12-31 | 6 ppb | Below the action level, but detectable |
| 2007-01-01 → 2007-12-31 | 7.23 ppb | Below the action level, but detectable |
| 2006-01-01 → 2006-12-31 | 4 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 2026-09-13)
EPA UCMR5 monitoring, 2023-08-07 to 2024-06-24 · 348 PFAS results at entry points to the distribution system
No PFAS detected. None of the 348 UCMR5 PFAS results for WINDSOR TOWN OF were at or above the method reporting limit. Reporting limits are about 3–5 ppt, so “not detected” means below that threshold — not proven zero.
| Compound | Detects / samples | Max (ppt) | Reporting limit | EPA MCL |
|---|---|---|---|---|
| PFOA | 0 / 12 | < 4 | 4 ppt | 4 ppt |
| PFOS | 0 / 12 | < 4 | 4 ppt | 4 ppt |
| PFHxS | 0 / 12 | < 3 | 3 ppt | 10 ppt |
| PFNA | 0 / 12 | < 4 | 4 ppt | 10 ppt |
| HFPO-DA | 0 / 12 | < 5 | 5 ppt | 10 ppt |
| PFBS | 0 / 12 | < 3 | 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.
What PFAS are and how to remove them →
Source: UCMR5 occurrence data, EPA Data Summary July 2026 (UCMR5_All.txt)
EPA Six-Year Review 4 compliance samples for WINDSOR TOWN OF · finished water only · dated data, released 2024
These are the regulated-contaminant samples WINDSOR TOWN OF reported to its state between 2012 and 2019 — the most recent nationwide sample-level dataset EPA has published. Total trihalomethanes (TTHM), Haloacetic acids (HAA5) are flagged below; the status column explains why. Treat this as history, not today's tap water.
| Contaminant | Samples | Average | Max | EPA limit | Status |
|---|---|---|---|---|---|
| Total trihalomethanes (TTHM) | 124 | 45.315 µg/L | 116 µg/L | 80 µg/LMCL (LRAA) | 3 single samples over MCL; average within limit |
| Haloacetic acids (HAA5) | 124 | 23.588 µg/L | 74.3 µg/L | 60 µg/LMCL (LRAA) | 1 single sample over MCL; average within limit |
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)
A point-of-use (under-sink) system typically runs $200-$600 installed; whole-house treatment $1,000-$3,000+ depending on flow and what has to come out. Tell us where you are and a certified water-treatment installer serving Windsor will follow up - no obligation.
WINDSOR TOWN OF · 9,460 service lines inventoried · Q2 2026 snapshot
WINDSOR TOWN OF reports no lead or galvanized-requiring-replacement service lines and has classified 100% of its 9,460 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 CO0162843 · See all Colorado 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 Windsor 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 Windsor 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 Windsor 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.
What Windsor residents measured at their own tap (ZIPs 80550). All reader results →
Reader submissions are unverified and shown separately from EPA data. They reflect one tap on one day, not the utility's compliance record.
No reader results for Windsor yet - yours would be the first. A hardness or TDS number from a $10 strip kit is enough to start the map.
Help build the first reader-sourced water map. Enter whatever your test strip, TDS pen or lab report shows - one number is enough.
Windsor ranks #17 of 35 graded Colorado cities.
Deep-dive guides for the specific contaminants EPA data flagged in Windsor's water, with removal options for each.
Yes — by EPA's records Windsor, CO tap water is safe to drink and earns an A. The grade rests on lead at 5.8 ppb (90th percentile) — under the 15 ppb action level but above 5 ppb. Lead from your own service line or plumbing is the main risk city-level data cannot see, so homes built before 1986 should still test at the tap.
WINDSOR TOWN OF's most recent Lead and Copper Rule result (2023-01-01 to 2025-12-31) was 5.8 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.
No. None of the 348 UCMR5 PFAS results for WINDSOR TOWN OF (2023-08-07 to 2024-06-24) were at or above the reporting limit of roughly 3–5 ppt.
WINDSOR TOWN OF has 3 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.
WINDSOR TOWN OF reports purchased surface water as its primary source and serves about 23,500 people (EPA PWSID CO0162843).
Optional but sensible. The findings on this page are below federal limits; an NSF-certified pitcher or under-sink filter handles lead and improves taste.
Lead was found at 5.8 ppb (90th percentile) in Windsor's latest tap sampling — below the action level, but there is no safe level of lead.
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Filters rated for lead reduction
Waterdrop's lead collection — every filter here is selected for lead reduction, so you can compare options rated for this exact problem.
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Whole-house system — treats every tap at the source
For consistently poor water, a whole-home system filters every faucet, shower, and appliance — the permanent, install-once fix that goes beyond a single point-of-use filter.
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Based on contaminants detected in your water, these resources may be helpful:
Find the right filter for your Windsor water quality needs:
Tap water is one piece of the picture — our sister sites cover the rest for Windsor, CO.
County radon prediction and EPA zone for homes around Windsor.
Arsenic and nitrate risk for homes on a well instead of city water.
Understand your water better with our in-depth guides on contaminants, filtration, and water safety.