Yes. France's US State Department rating is Level 2 ("exercise
increased caution") — the same band as Italy, the UK, and
Germany — and the elevated level reflects generic European
terrorism risk, not anything specific to Saint-Germain or the
western Paris suburbs. Saint-Germain itself is one of the most
affluent and safest communes in the Île-de-France region;
violent crime against travelers is rare. The realistic risk is
opportunistic pickpocketing on the RER A line into Paris (the
most-targeted commuter line by pickpockets in greater Paris)
and at the major Paris stations on transfer days.
On a Passports teacher-led trip the group is never on public
transport alone, the Tour Director runs a pickpocket-awareness
briefing on the first evening, and every hotel is pre-vetted for
24-hour reception and secure room storage. We operate a 24/7
emergency line out of Boston, keep parents on a daily-update
channel, and have English-speaking medical contacts in every
city we visit. For most teachers running their first school
group tours to France, a Saint-Germain base feels easier and
quieter than central Paris.