Drinking water quality · 2023
· Verified
· PWSID CA3610057
What's in Riverside Highland Water Company — Grand Terrace, Ca, CA tap water
3 contaminants in Riverside Highland Water Company — Grand Terrace, Ca, CA's water sat at or above a federal limit, led by Perfluorohexanesulfonic acid at 90.0x the limit.
- !3 contaminants at or above a federal limit — worst is Perfluorohexanesulfonic acid at 90.0x
- !1 open monitoring or reporting violation
- !13 of 27 core regulated contaminants reported — 14 never appear in this report
+How this score is calculated
Every system starts at 100. Points come off for measured levels, for the federal violation record, and for how much of the core regulated set the utility actually reported. All three inputs are the utility's own published numbers and EPA's own records.
- −60 contaminants at or above a federal limit
- −0 contaminants within 20% of a limit
- −0 open health-based violations
- −3 open monitoring / reporting violations
- −0 health-based violations resolved in the last 5 years
- −9 core regulated contaminants never reported (13/27)
A 90–100 · B 80–89 · C 70–79 · D 60–69 · F below 60. A system reporting under a third of the core set is capped at C however clean its numbers look — a short report is not a clean bill of health.
Full grading methodology, constant for constant →What to worry about
- Perfluorohexanesulfonic acid90.0× the federal limit900 ng/L · limit 10 ng/L
Regulated by the EPA at 10 parts per trillion and included in the PFAS Hazard Index.
Higher than 95% of CA systems that report it · higher than 95% of U.S. systems
- PFOA3.5× the federal limit0–14 ng/L · limit 4 ng/L
Linked to cancer, liver damage, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.
Higher than 95% of CA systems that report it · higher than 95% of U.S. systems
- PFOS3.5× the federal limit0–14 ng/L · limit 4 ng/L
Linked to cancer, thyroid disease, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.
Higher than 80% of CA systems that report it · higher than 80% of U.S. systems
+20 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| Nitrate | 1.8–6.7 mg/L | 10 mg/L |
| Chlorine | 1.4 mg/L | 4 mg/L |
| Arsenic | 2.9–3.5 ug/L | 10 ug/L |
| Gross Alpha | 3.4 pCi/L | 15 pCi/L |
| Fluoride | 0.22–0.64 mg/L | 4 mg/L |
| TTHM | 4.8 ug/L | 80 ug/L |
| Chromium | 0–1.7 ug/L | 100 ug/L |
| Chromium, Total | 1.1 ug/L | 100 ug/L |
| Copper | 0.29 ug/L | 1300 ug/L |
| HAA5 | Not detected ug/L | 60 ug/L |
| Lead | Not detected ug/L | 15 ug/L |
| Escherichia coli (E. coli) | 0 | 0 |
| Total Coliform | 0 | 0 |
| Perfluorobutanesulfonic acid | 0–10 ng/L | — |
| Perfluoroheptanoic acid | 0–14 ng/L | — |
| Perfluorohexanoic acid | 0–18 ng/L | 5.1 ng/L |
| Perfluoropentanoic acid | 0–12 ng/L | 6.5 ng/L |
| PFBA | 0–17 ng/L | — |
| Uranium | Not detected pCi/L | 20 pCi/L |
| 1,2,3-TCP | Not detected | — |
What this report doesn't tell you
14 of the 27 contaminants a community water system normally reports do not appear anywhere in Riverside Highland Water Company — Grand Terrace, Ca, CA's data. Absent is not the same as absent-from-the-water — it means nobody published a number.
+Full detail: PFAS testing, water source, historical monitoring, and the federal violation record
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.
- Maximum contaminant level exceededHealth-based1 violation on record · most recent Apr 1998resolved
- Monitoring & reporting1 violation on record · most recent Sep 20241 open
- Monitoring1 violation on recordresolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗