Tap Water Quality Report
Tap water quality in CENTENNIAL, Colorado
Tap water in CENTENNIAL, Colorado receives a grade of C (78/100) from TapWaterSafety.org. It's served by SOUTHGATE WSD. The most significant water quality concerns are: Haloacetic acids (HAA9)* significantly above health guideline; Total trihalomethanes (TTHMs)* significantly above health guideline; Haloacetic acids (HAA5)* significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in CENTENNIAL's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving CENTENNIAL.
Haloacetic acids (HAA9)* significantly above health guideline
Moderate concernHaloacetic acids (HAA9)* detected at 14.7 ppb, 246x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs)* significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs)* detected at 28.9 ppb, 192x above the EWG health guideline of 0.15 ppb.
Haloacetic acids (HAA5)* significantly above health guideline
Moderate concernHaloacetic acids (HAA5)* detected at 16.6 ppb, 166x above the EWG health guideline of 0.1 ppb.
EPA compliance record
Official U.S. EPA records for SOUTHGATE WSD (system ID CO0103721) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for CENTENNIAL
Filters matched to the specific contaminants in CENTENNIAL's water supply.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in CENTENNIAL's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA9)* Disinfection byproduct |
14.7 ppb | 0.06 | — | — | — | — | — | 246× over |
| Total trihalomethanes (TTHMs)* Disinfection byproduct |
28.9 ppb | 0.15 | 80.0 | 100 | — | — | — | 192× over |
| Haloacetic acids (HAA5)* Disinfection byproduct |
16.6 ppb | 0.1 | 60.0 | 60 | — | — | — | 166× over |
| Bromodichloromethane* Disinfection byproduct |
8.02 ppb | 0.06 | — | — | — | — | — | 134× over |
| Trichloroacetic acid* Disinfection byproduct |
6.33 ppb | 0.1 | — | — | — | — | — | 63× over |
| Dichloroacetic acid* Disinfection byproduct |
10.1 ppb | 0.2 | — | — | — | — | — | 51× over |
| Chloroform* Disinfection byproduct |
18.9 ppb | 0.4 | — | — | — | — | — | 47× over |
| Dibromochloromethane* Disinfection byproduct |
1.9 ppb | 0.1 | — | — | — | — | — | 19× over |
| Radium, combined (-226 and -228)* Radiological |
0.74 pCi/L | 0.05 | 5.0 | — | — | — | — | 15× over |
| Dibromoacetic acid* Disinfection byproduct |
0.119 ppb | 0.03 | — | — | — | — | — | 4.0× over |
| Chromium (hexavalent)* Heavy metal |
0.0378 ppb | 0.02 | — | — | — | — | — | 1.9× over |
| Nitrate* Inorganic |
0.0578 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | Below guideline |
| Nitrate and nitrite* Inorganic |
0.0578 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | Below guideline |
| Molybdenum* Other |
6.86 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Manganese* Heavy metal |
8.41 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Barium* Heavy metal |
34.0 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Uranium* Radiological |
0.02 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | Below guideline |
| Cadmium* Heavy metal |
0.00122 ppb | 0.04 | 5.0 | 5 | 3 | 0.04 | — | Below guideline |
| Vanadium* Other |
0.264 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Bromoform* Disinfection byproduct |
0.00622 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Strontium* Radiological |
0.171 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| 4-Androstene-3,17-dione* Other |
0.027 ppt | — | — | — | — | — | — | Below guideline |
| Chlorodifluoromethane* Other |
0.00808 ppb | — | — | — | — | — | — | Below guideline |
| Chromium (total)* Heavy metal |
0.0841 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride* Inorganic |
0.607 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Lithium* Other |
4.08 ppb | — | — | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from SOUTHGATE WSD.