Water Quality Report · Updated October 07, 2026
SOUTHGATE WSD
SOUTHGATE WSD delivers tap water graded B (78/100) by TapWaterSafety.org. The utility serves approximately 55,000 residents in CENTENNIAL, Colorado using surface water (purchased). 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. For questions, the utility can be reached at 303-779-0261.
Is CENTENNIAL tap water safe to drink?
SOUTHGATE WSD delivers tap water that earns a grade of B (78/100) from TapWaterSafety.org — a good rating, with only minor concerns relative to health-based guidelines.
The utility serves 55,000 residents in CENTENNIAL, drawing from surface water (purchased).
Public testing data identifies 11 contaminants in this water above EWG's health-based guidelines, including: Haloacetic acids (HAA9)*, Total trihalomethanes (TTHMs)*, Haloacetic acids (HAA5)*, Bromodichloromethane*, Trichloroacetic acid*, Dichloroacetic acid*, Chloroform*, Dibromochloromethane*, Radium, combined (-226 and -228)*, Dibromoacetic acid*, Chromium (hexavalent)*. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
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.
Quick actions for CENTENNIAL residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for SOUTHGATE WSD.
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.
Contact SOUTHGATE WSD
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Recommended water filters for CENTENNIAL
Filters matched to the specific contaminants in this 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.
Score breakdown
This utility's overall score of 78/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
SOUTHGATE WSD service area
This water system serves 1 community in Arapahoe County, Colorado. Click any city for its dedicated tap water quality page.
Find the right filter for CENTENNIAL water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.