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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 SOUTH ADAMS COUNTY WSD • Updated September 2026
Grade A — based on EPA compliance records, lead testing and PFAS monitoring
SOUTH ADAMS COUNTY WSD 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, Commerce City's tap water earns a A: no health-based violations in five years, lead at 0 ppb (90th percentile) and only low-level PFAS (PFBA, PFHxA, PFPeA). Lead from home plumbing is the main remaining risk.
By EPA's records, yes. SOUTH ADAMS COUNTY WSD earns a A: no health-based violations in the last five years, a lead 90th-percentile result of 0 ppb, and PFAS (PFBA, PFHxA, PFPeA) below federal limits. Lead from your own plumbing is the main risk city data cannot see.
SOUTH ADAMS COUNTY WSD'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 (2024-03-06 to 2024-12-16) detected PFBA, PFHxA, PFPeA, all below federal MCLs. Reverse osmosis and certified activated-carbon filters reduce PFAS.
No. EPA's SDWIS shows no violations of any kind for SOUTH ADAMS COUNTY WSD since 2016.
SOUTH ADAMS COUNTY WSD reports purchased surface water as its primary source and serves about 75,559 people (EPA PWSID CO0101140).
Optional but sensible. The findings on this page are below federal limits; an NSF-certified pitcher or under-sink filter handles PFAS and improves taste.
Want to know what's really in your Commerce City tap water?
PFBA, PFHxA, PFPeA were detected in Commerce City's water at low levels in 2023–2025 EPA monitoring.
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SOUTH ADAMS COUNTY WSD · 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.
No violations of any kind on file since 2016.
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 SOUTH ADAMS COUNTY WSD
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 SOUTH ADAMS COUNTY WSD 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 |
| 2022-07-01 → 2022-12-31 | 1 ppb | Well below the 15 ppb action level |
| 2022-01-01 → 2022-06-30 | 1 ppb | Well below the 15 ppb action level |
| 2021-07-01 → 2021-12-31 | 1 ppb | Well below the 15 ppb action level |
| 2021-01-01 → 2021-06-30 | 2 ppb | Well below the 15 ppb action level |
| 2020-07-01 → 2020-12-31 | 2 ppb | Well below the 15 ppb action level |
| 2020-01-01 → 2020-06-30 | 2.4 ppb | Well below the 15 ppb action level |
| 2019-01-01 → 2019-12-31 | 2.2 ppb | Well below the 15 ppb action level |
| 2018-01-01 → 2018-12-31 | 2.4 ppb | Well below the 15 ppb action level |
| 2017-01-01 → 2017-12-31 | 2.6 ppb | Well below the 15 ppb action level |
| 2014-01-01 → 2016-12-31 | 2.3 ppb | Well below the 15 ppb action level |
| 2011-01-01 → 2013-12-31 | 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 2026-09-06)
EPA UCMR5 monitoring, 2024-03-06 to 2024-12-16 · 348 PFAS results at entry points to the distribution system
PFBA, PFHxA, 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 / 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 |
| PFBA | 4 / 12 | 9.5 | 5 ppt | hazard index only |
| PFHxA | 3 / 12 | 4.4 | 3 ppt | hazard index only |
| PFPeA | 5 / 12 | 11.4 | 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 9 of 12 samples, max 26.7 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 SOUTH ADAMS COUNTY WSD · finished water only · dated data, released 2024
These are the regulated-contaminant samples SOUTH ADAMS COUNTY WSD reported to its state between 2012 and 2019 — the most recent nationwide sample-level dataset EPA has published. Total trihalomethanes (TTHM) 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 | 200 detects | 0 µg/L | ND | 10 µg/LMCL | Not detected |
| Nitrate (as N) | 318317 detects | 5.338 mg/L | 8.46 mg/L | 10 mg/LMCL | Within MCL |
| Fluoride | 264 | 0.776 mg/L | 2.31 mg/L | 4 mg/LMCL | Within MCL |
| Chromium (total) | 200 detects | 0 µg/L | ND | 100 µg/LMCL | Not detected |
| Uranium (combined) | 18 | 16.489 µg/L | 21 µg/L | 30 µg/LMCL | Within MCL |
| Radium-226/228 | 65 detects | 0.1 pCi/L | 0.2 pCi/L | 5 pCi/LMCL | Within MCL |
| Gross alpha | 1810 detects | 1.378 pCi/L | 5 pCi/L | 15 pCi/LMCL | Within MCL |
| Total trihalomethanes (TTHM) | 256 | 34.123 µg/L | 84.38 µg/L | 80 µg/LMCL (LRAA) | 1 single sample over MCL; average within limit |
| Haloacetic acids (HAA5) | 252251 detects | 20.545 µg/L | 56.8 µg/L | 60 µg/LMCL (LRAA) | Within MCL |
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)
SOUTH ADAMS COUNTY WSD · 24,862 service lines inventoried · Q2 2026 snapshot
SOUTH ADAMS COUNTY WSD reports no lead or galvanized-requiring-replacement service lines and has classified 100% of its 24,862 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 CO0101140 · 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 Commerce City 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 Commerce City 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 Commerce City 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.
Commerce City ranks #24 of 35 graded Colorado cities.
By EPA's records, yes. SOUTH ADAMS COUNTY WSD earns a A: no health-based violations in the last five years, a lead 90th-percentile result of 0 ppb, and PFAS (PFBA, PFHxA, PFPeA) below federal limits. Lead from your own plumbing is the main risk city data cannot see.
SOUTH ADAMS COUNTY WSD'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 (2024-03-06 to 2024-12-16) detected PFBA, PFHxA, PFPeA, all below federal MCLs. Reverse osmosis and certified activated-carbon filters reduce PFAS.
No. EPA's SDWIS shows no violations of any kind for SOUTH ADAMS COUNTY WSD since 2016.
SOUTH ADAMS COUNTY WSD reports purchased surface water as its primary source and serves about 75,559 people (EPA PWSID CO0101140).
Optional but sensible. The findings on this page are below federal limits; an NSF-certified pitcher or under-sink filter handles PFAS and improves taste.
PFBA, PFHxA, PFPeA were detected in Commerce City's water at low levels in 2023–2025 EPA monitoring.
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Based on contaminants detected in your water, these resources may be helpful:
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